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Electric charge and force

Total questions: 148

Worksheet time: 5hrs 15mins

Name
Class
Date
1.

A plastic rod is rubbed with a piece of animal fur. The plastic rod acquires a negative charge during this process. Which of the following is true about the charge on the piece of fur?

a)

It acquires a positive charge but greater in magnitude than the rod

b)

It acquires a positive charge but less in magnitude than the rod

c)

It acquires a negative charge but greater in magnitude than the rod

d)

It acquires a negative charge but less in magnitude than the rod

e)

It acquires a positive charge with the same magnitude as the rod

2.
If each of the charges doubles, what happens to the electric force?
a)
Quadruples
b)
Doubles
c)
Stays the same
d)
Reduced by half
3.
If the distance between 2 charges doubles, what happens to the electrostatic force?
a)
Reduced by half
b)
Reduced by 1/4
c)
Stays the same
d)
Quadruples
4.
If the distance between two electric charges is reduced by half, what happens to the electrostatic force?
a)
Quadruples
b)
Doubles
c)
Triples
d)
Reduces by half
5.
Electrostatic force F is directly proportional to:
a)
r^2 (distance squared)
b)
q1
c)
q2
d)
both q1 and q2
6.
When distance increases, electrostatic force ____________; we call this relationship ____________ proportional
a)
decreases;directly
b)
decreases;inversely
c)
increases;inversely
d)
increases;directly
7.

Find the magnitude of the electrostatic force between two charges of 1.0 C each, which are 1.0 meter apart?

a)

9 x 10^19 N

b)

9 x 10^9 N

c)

1.1 x10^10 N

d)

1.1x 10^-10 N

8.

Calculate the force exerted between two charged objects separated by a distance of 0.6 m. One object has a charge of -5 C and the other has a charge of +2.0 C.

a)

-1.5E-11 N

b)

2.5E-11 N

c)

-2.5E11 N

d)

-7.5E-10 N

9.
What variable do meters represent?
a)
Electrostatic Charge
b)
Force
c)
Distance
d)
Mass
10.
What variable do "Newtons" represent?
a)
Electrostatic Charge
b)
Force
c)
Distance
d)
Mass
11.
What variable do Coulombs represent?
a)
Electrostatic Charge
b)
Force
c)
Distance
d)
Mass
12.
Two oppositely charged particles are held in place near each other. When the particles are released, what will most likely happen?
a)
the will accelerate towards each other
b)
they will accelerate away from each other
c)
they will move towards each other at a constant speed
d)
they will move away from each other at a constant speed
13.
Two like charged particles are held in place near each other. When the particles are released, what will most likely happen?
a)
the will accelerate towards each other
b)
they will accelerate away from each other
c)
they will move towards each other at a constant speed
d)
they will move away from each other at a constant speed
14.
The Electric Force is strongest when charges are...
a)
close together
b)
far apart
c)
the electric force is constant everywhere
15.
The distance between two charges doubles at the same time that the charge on each also doubles.  What happens to the electric force?
a)
doubles
b)
quadruples
c)
cut in half
d)
no change
16.
Two charges separated by a distance of 1 meter exert a 20-N force on each other. If the charges are pulled to a 2 meter separation distance, the force on each charge will be 
a)
10 N
b)
5 N
c)
2.5 N
d)
40 N
17.
What are the two types of charges that objects may possess?
a)
+ and +
b)
+ and -
c)
+ and neutral 
d)
- and neutral 
18.
What equation is this:
FE= (k*q1*q2) / r2 
a)
Coulombs law
b)
Ohms law
c)
Newtons law
19.
1 Coulomb is equivalent to
a)
6 x 10^17 Charges
b)
6 x 10^18 Charges
c)
6 x 10^19 Charges
d)
6 x 10^20 Charges
20.
According to Coulomb's Law, what will happen to the Electrostatic Force between 2 objects if the distance between them is is quadrupled?
a)
the force will decrease to 1/16 the original strength
b)
the force will increase by 16x
c)
the force will increase by 4x
d)
the force will decrease to 1/4 the original strength
21.

As shown in the figure, the charge Q is midway between two other charges. If Q= -7.5 nC what must be the charge q1 so that charge q2 remains stationary as Q and q1 are held in place?

a)

30 nC

b)

15 nC

c)

7.5 nC

d)

60 nC

22.
What subatomic particles would you find in the nucleus of an atom?
a)
Protons only
b)
Protons and Neutrons
c)
Neutrons and Electrons
d)
Protons and Electrons 
23.
Which subatomic particles contribute the most to the mass of an atom?
a)
Protons, Neutrons, Electrons
b)
Protons only
c)
Protons and Electrons
d)
Protons and Neutrons
24.
Protons and Electrons balance the charge of an atom.
a)
True
b)
False
25.
Electric charges that are different _______ each other.
a)
Attract
b)
Repel
26.

The net force due to different charges around a single charge can be determined using superposition principle. True or False?

a)

True

b)

False

27.

According to Coulomb's Law, The greater the separation distance between two charges the greater the magnitude of the electric force. True or False?

a)

True

b)

False

28.

Coulomb's Law states that the electric force is directly proportional to the product of the two charges and inversely proportional to the distance between them. True or False?

a)

True

b)

False

c)

not enough information

29.

Which of the following charges is the best example of 'Charged is Quantized'?

a)

2.1nC

b)

3.0µC

c)

2.75µC

d)

3333.1µC

30.

The mass of a single electron is equal to 9.109x10-31C. True or False?

a)

True

b)

False

31.

The separation distance between two charges is equal to r=√(k.(q1q2/Fe)). True of False

a)

True

b)

False

32.

Electric field is directly proportional to the charge and inversely proportional to the magnitude of electric force. True or False?

a)

True

b)

False

33.

Two identical conducting spheres are separated by a distance. Sphere A has a net charge of 5 µC and sphere B has a net charge of 1 µC. If the spheres touch and are moved apart, the net charge on Sphere A will be:

a)

10 µC

b)

3 µC

c)

–6 µC

d)

–5 µC

34.

A negatively charged rod is brought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged rod will be charged

a)

positive

b)

neutral

c)

negative

d)

none of the other answer choices are correct

35.

Sphere A carries a net charge and sphere B is neutral. They are placed near each other on an insulated table. Which statement best describes the electrostatic force between them?

a)

There is no force between them since one is neutral.

b)

There is a force of attraction between them.

c)

There is a force of repulsion between them.

d)

The force is attractive if A is charged positively and repulsive if A is charged negatively.

36.

Sphere A carries a net positive charge, and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded (see picture). Which statement is correct?

a)

sphere B remains neutral

b)

sphere B is now negatively charged

c)

sphere B is now positively charged

d)

sphere B is now positive and sphere A is negative

37.

Two positive charges A and B are placed at the corners of equilateral triangle. What is the direction of the net electric force on charge –Q located at point C?

a)
b)
c)
d)
38.

Two positive charges A and B are placed at the corners of equilateral triangle. What is the direction of the net electric force on charge –Q located at point C?

a)
b)
c)
d)
39.

MULTICORRECT (Choose 2): As shown on the right, a positively charged sphere, Q1 = 3Q is separated from a negatively charged sphere, Q2 = -10Q by a distance r. The spheres briefly touch each other and move to the original distance r. Which of the following is true about the new charge on the spheres and the new force between the spheres?

a)

The new charge on each sphere is

6.5Q.

b)

The new force between the spheres

is repulsive

c)

The new charge on each sphere is

–3.5Q.

d)

The new force between the spheres

is attractive

40.

A balloon has a negative charge. A glass rod has a positive charge. What will happen when the rod is brought near the balloon?

a)

the balloon will be attracted to the rod

b)

the balloon will remain in place

c)

the balloon will be repelled by the rod

d)

the balloon will spin in circles

41.

Two charges are near each other. The magnitude of both charges is doubled. By what factor will the Coulomb force change?

a)

2

b)

4

c)

1/2

d)

1/4

42.

If the distance between two charges triples, by what factor will the force between them change?

a)

3

b)

9

c)

1/3

d)

1/9

43.

What is the magnitude of the electric force between two charges of 1.0C separated by a distance of 1.0m?

a)

9.0x10^9 N

b)

1.1x10^10 N

c)

9.0x10^19 N

d)

1.1x10^-10 N

44.
Calculate the force exerted between two charged objects separated by a distance of 0.6 m. One object has a charge of -5 C and the other has a charge of +2.0 C.
a)
-1.5E-11N
b)
-2.5E11N
c)
-2.5E-11N
d)
-7.5E-10N
45.
Two oppositely charged particles are held in place near each other. When the particles are released, what will most likely happen?
a)
they will accelerate towards each other
b)
they will accelerate away from each other
c)
they will move towards each other at a constant speed
d)
they will move away from each other at a constant speed
46.
The distance between two charges doubles at the same time that the charge on each also doubles. What happens to the electric force?
a)
doubles
b)
quadruples
c)
cut in half
d)
no change
47.

As shown in the figure, the charge Q is midway between two other charges. If Q= -7.5 nC what must be the charge q1 so that charge q2 remains stationary as Q and q1 are held in place?

a)

30 nC

b)

15nC

c)

7.5nC

d)

60nC

48.
If an object has a net charge of +2e this means it has
a)
lost 2 electrons
b)
gained 2 electrons
c)
lost 2 protons
d)
gained 2 protons
49.
An object with a charge of -2q is brought into contact with an identical object with a charge of +5q. The objects are then separated. Each object now has what charge respectively?
a)
+5q and -2q
b)
+1.5q and -1.5q
c)
+3.5q and +3.5q
d)
+1.5q and +1.5q
50.
Two positive point charges repel each other with force 0.36 N when their separation is 1.5 m. What force do they exert on each other when their separation is 1.0 m?
a)
0.81N
b)
0.36N
c)
0.24N
d)
0.16N
51.

Two small hollow metal spheres hung on insulating threads attract one another as shown. It is known that a positively charged rod will attract sphere A. Which statements can be correctly concluded about the charge on the spheres?

a)

A has a positive charge

b)

B has a negative charge

c)

A and B have opposite charges

d)

A is neutral

52.

As shown above, two particles, each of charge +Q, are fixed at opposite corners of a square that lies in the plane of the page. A positive test charge +q is placed at a third corner. What is the direction of the net force on the test charge due to the other two charges?

a)
b)
c)
d)
53.

Given the formula above which is a true statement?

a)

C is directly proportional to A; C is inversly proportional to d in the Capacitance formula

b)

C is directly proportional to A; C is directly proportional to d in the Capacitance formula

c)

C is inversely proportional to A; C is inversly proportional to d in the Capacitance formula

d)

C is directly proportional to A; C is inversly proportional to E in the Capacitance formula

54.
What charge is stored in a 340 μF capacitor when 220 V is applied to it? when Q=CxV
a)
.075 C
b)
.666 C
c)
.0216 C
d)
6.6x10^-10 C
55.
Calculate the voltage applied to a 5.00 μF capacitor when it holds 4.10 mC of charge when Q=CxV
a)
1.6 V
b)
.645 V
c)
6.2 V
d)
820 V
56.

What capacitance is needed to store 5.50 μC of charge at a voltage of 120 V (if Q=CxV)

a)

250 uF

b)

.025 uF

c)

.046 uF

d)

458 uF

57.
Find the capacitance of a parallel plate capacitor having plates of area 7.00 m2 that are separated by 0.500 mm of AIR if C=(KxExA)/d (where K is dielectric constant, E is dielectric strength, A= area of plates and d= distance of plates)
a)
42000000000 F 
b)
105,000,000 F 
c)
630,000,000,000 F 
d)
not enough information given
58.

If Two charges were seperated by .075 decimeters (dm) with an opposite charge equal to four electrons and three protons (*see the funamental charge for quantity), what would be the resulting Electric Force?

a)

7.2x10^(-4) N repel

b)

2.304x10^(-22) N repel

c)

4.92x10^(-23) N attract

d)

2.304x10^(-22) N attract

59.

If Two charges were seperated by .25 nanometers (nm) with an same charge equal to 4 electrons per charge (*see the funamental charge for quantity), what would be the resulting Electric Force?

a)

8.29x10^(-23) N attract

b)

46 N repel

c)

8.29x10^(-23) N repel

d)

5.9x10^(-8) N repel

60.

How far apart must two protons be if the force between them is 1.125x10^(-5) N

a)

2.304x10^(-16) m repel

b)

4.5 x10^(-12) m repel

c)

1.2x10^(-8) m attract

d)

1.44x10^(-16) m attract

61.
The field lines for these charges must be?
a)
+, +
b)
+, -
c)
_ , _
62.
The field lines shown must?
a)
attract
b)
repel
c)
ionize
d)
polarized
63.
Given the change from top charge and distance to the bottom, what is the resulting change in F if Fe=q1xq2/d^2
a)
6F
b)
1/8F
c)
9/64F
d)
1/64F
64.
If the following changes occurs in charges and distance how does it effect the force? (if F=q1xq2/d^2)
a)
6F
b)
9/64F
c)
1/8F
d)
1/64F
65.

If I=q/t and there is a charge of 2 protons (fundamental charge of electron/proton is 1.6x10^(-19)C) and it takes 25 centiseconds to pass through the wire, what the current?

a)

3.2x10^(-19) A

b)

8x10^(-20) A

c)

1.28x10^(-18) A

d)

6.4x10^(-21) A

66.

If E=F/q and there is a charge of 2 electrons (fundamental charge of electron/proton is 1.6x10^(-19)C) and it takes 25x10^(-12) N of Force, what is the electric field strength of this charge?

a)

7.8x10^(7) N/C

b)

1.6^(8) N/C

c)

1.28x10^(-18) N/C

d)

6.4x10^(-21) N/C

67.
Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.
a)
+,+
b)
+,-
c)
-,+
d)
-,-
68.

The diagram shows two charged objects, X and Y.


Based on the field lines, what are the charges of the objects?

a)

X: positive

Y: negative

b)

X: negative

Y: positive

c)

X: negative

Y: negative

d)

X: positive

Y: positive

69.
If each of the charges doubles, what happens to the electric force?
a)
Quadruples
b)
Doubles
c)
Stays the same
d)
Reduced by half
70.

In order to create an electric charge, what type of particle must be added or removed from an object?

a)

proton

b)

electron

c)

neutron

d)

alpha particle

71.
The push or pull between charged objects is an
a)
electric force
b)
electric discharge
c)
electric field
72.

what is the type of this charge?

a)

positive

b)

negative

73.

which of the following has more electric filed?

a)

B

b)

c

c)

A

d)

B and A

74.
When you stretch a rubber band, you are storing __________ energy. 
a)
kinetic 
b)
potential
c)
none of the above
d)
all of the above 
75.
Which would have the greatest gravitational potential energy?
a)
A 4lb rat on a school desk
b)
A 45lb dog in an oak tree
c)
A 14 pound platypus on a swing
d)
A 45lb child on a bike
76.
Two like charges
a)
 neutralize each other.
b)
repel each other. 
c)
must be neutrons. 
d)
attract each other.
77.
What does it mean when the electric field lines are close together?
a)
the field is positive
b)
the field is negative
c)
The field is strong
d)
the field is weak
78.
When a balloon is rubbed on clothes it acquires a charge by ___________
a)
Induction
b)
reduction
c)
friction 
d)
concuction
79.
What do you call the process of charging a conductor by bringing it near another charged object?
a)
induction
b)
polarization
c)
neutralization
d)
conduction
80.

What direction are the electric field lines around a proton?

a)

towards the charge

b)

away from the charge

81.

Which orientation of an electric dipole in a uniform electric field would correspond to stable equilibrium ?

a)

Parallel

b)

Perpendicular

c)

Non of this

d)

Not dependent

82.

What is the electric flux through a cube of side 1 cm which encloses an electric dipole?

(a)  

83.

Given a uniform electric field E=5 x 10^3N/Ci, find the flux of this field through a square of 10 cm on a side whose plane is parallel to the y-z plane.

a)

50Nm^2/C

b)

30Nm^2/C

c)

25Nm^2/C

d)

500Nm^2/C

84.

Given a uniform electric field E = 5 x 10^3iN/C , passing through a square of 10 cm on a side whose plane is parallel to the y-z plane. What would be the flux through the same square if the plane makes a 30° angle with the x-axis?

a)

100Nm^2/C

b)

25√3 Nm^2/C

c)

25 Nm^2/C

d)

50√3 Nm^2/C

85.

A charge Q placed at each of the positive corners of a square. A charge q is placed at each of the other two corners. If the net force on charge Q is zero then, what is Q/q

a)

1

b)

-1/√2

c)

-2√2

d)

1/√2

86.

A Gaussian surface in the figure is shown by dotted line. The electric field on the surface will be

a)

Due to q1 and q2 only

b)

Due to q2 only

c)

0

d)

Due to all

87.

Dimension of permittivity of free space

a)

M^(-1) L^2 A^3 T^2

b)

M^(-1) L^(-3) A^2 T^4

c)

M^(-1) L^(-3) A^4 T^2

d)

Non of these

88.

Six charges of equal magnitude , 3 negative are to be placed on PQRSTU comers of a regular hexagon, such that field at the centre is double that of what it would have been if only one +ve charge is placed at R.

a)

+,-,+,-,+,-

b)

+,+,-,+,-,-

c)

-,+,+,-,+,-

d)

+,-,+,-,-,+

89.

Between two point charged bodies, the force of electrical interaction is 12 mN. If the charge of one body is increased by 3 times, and the charge of the other body is reduced by 4 times and the distance between the bodies is reduced by 2 times, then what will be the strength of the interaction between the bodies? (Give the answer in mN.)

a)

12 мН

b)

24 мН

c)

36 мН

d)

48 мН

90.

Two point charges - negative, equal in absolute value to 3 μC, and positive, equal in absolute value to 4 μC, are located at a distance of 1 m from each other. At a distance of 1 meter from each of these charges, a positive charge Q is placed, whose modulus is 2 μC. Determine the modulus of the force acting on the charge Q from the other two charges. Express the answer in mN and round to the nearest whole number.

a)

35 мН

b)

65 мН

c)

53 мН

d)

56 мН

91.

With what force do two small charged balls interact at a distance of 4 m from each other in a vacuum? The charge of each ball is 8 · 10 −8 C. Express the response in microns.

a)

1,2 мкН

b)

2,4 мкН

c)

3,6 мкН

d)

4,8 мкН

92.

The law, governing the force between electric charges is known as

a)

Ampere's law

b)

Ohm's law

c)

Coulomb's law

d)

Faraday's law

93.

The ratio of the forces between two small spheres with constant charge (a) in air (b) in a medium of dielectric constant K is

a)

1 : K

b)

K : 1

c)

1 : K2

d)

K 2: 1

94.

A body can be negatively charged by

a)

Giving excess of electrons to it

b)

Removing some neutrons from it

c)

Removing some electrons from it

d)

Giving some protons to it

95.

Two point charges placed at a certain distance r in air exert a force F on each other. Then the distance r' at which these charges will exert the same force in a medium of dielectric constant k is given by

a)

r

b)

r/K

c)

rk\frac{r}{\sqrt{k}}

d)

rkr\sqrt{k}

96.

Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is

a)

F / 8

b)

F / 4

c)

4F

d)

F/16

97.

Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon such that the electric force on a test charge at O is double the electric force when only one positive charge of same magnitude is placed at R. Which of the following arrangements of charges is possible for P, Q, R, S, T and U respectively

a)

+ , - , +, - , - , +

b)

+ , - , + , - , + , -

c)

+ , + , - , + , - , -

d)

-, + , + , - , + , -

98.

The charge q is projected into a uniform electric field E, work done when it moves a distance Y is

a)

qEy

b)

qY/E

c)

qE/Y

d)

Y/qE

99.

Tick the correct option.

a)

Electrostatic force is a conservative in nature.

b)

Two identical metallic spheres of exactly equal masses are taken. One is given a positive charge Q Coulombs and the other an equal negative charge. Their masses after charging are different.

c)

The electric force between two charges changes, if we bring a third charge closer to them.

d)

Electrostatic force is both attractive and repulsive.

100.
In the diagram below, P is a point near a negatively charged sphere. Which direction best represents the direction of the electric field at point P?
a)
Right
b)
Left
c)
Up 
d)
Down
101.
Which quantity and unit are correctly paired?
a)
electric field strength and N/C
b)
electricity and Coulombs
c)
electrostatic force and electrons
d)
electric field strength and E
102.
A point charge Q is far from all other charges. At a distance of 2 m from Q, the electric field is 20 N/C. What is the force a charge of 5 Coulombs feels?
a)
4 N
b)
100 N
c)
40 N
d)
10 N
103.
Which of the following statements is false about electric field lines
a)
electric field lines cannot cross
b)
electric field lines point away from positive charge
c)
electric field lines are always straight lines
d)
electric field lines show how a proton would move in an electric field
104.
At which point is the electric field the strongest
a)
A
b)
B
c)
C
d)
D
105.
At which point is the electric field the weakest?
a)
A because it is the furthest away
b)
A because the field lines are further apart
c)
C because the field lines are further apart
d)
C  because it is the furthest away
106.
Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.
a)
+,+
b)
+,-
c)
-,+
d)
-,-
107.
Consider the electric field lines drawn at the right for a configuration of two charges. Several locations are labeled on the diagram. Which of these shows the ranking in order of weakest to strongest correctly
a)
A, E, C
b)
D, E, C
c)
D, B, A
d)
A, D, B
108.
An electrostatic force of 2 X 102. newtons is exerted on a charge of 4 coulomb at point P in an electric field. The magnitude of the electric field intensity at P is
a)
8 X 102 N/C
b)
5 N/C
c)
2 X 10-2 N/C
d)
50 N/C
109.
It is observed that Balloon A is charged negatively. Balloon B exerts a repulsive effect upon balloon A. Would the electric field vector created by balloon B be directed towards B or away from B and why?
a)
towards because electric field lines point away from negative charges
b)
towards because electric field lines point away from positive charges
c)
away because electric field lines point away from negative charges
d)
away because electric field lines point toward positive charges
110.
QA and QB are two charges creating an electric field. Based on the electric field lines, we can conclude
a)
QA and QB are both positive
b)
QA and QB are both negative
c)
QA is positive and QB is negative
d)
QA is negative and QB is positive
111.
Which of the following is a true statement about the electric field between the two plates?
a)
The field is attractive between the plates and uniform in strength
b)
The field is repulsive between the plates and uniform in strength
c)
The field is attractive between the plates and strongest near the positive
d)
The field is repulsive between the plates and strongest near the positive
112.
The electrical force between charges is strongest when the charges are
a)
close together
b)
far apart
c)
 the electric force is constant everywhere.
d)
there is no pattern
113.
What is the magnitude of the electric field intensity at a point where a proton experiences an electrostatic force of magnitude 2.30 x 10-25 newton?
a)
1.44 x 10-6 N/C
b)
3.68 x 106 N/C
c)
1.44 x 1044 N/C
d)
3.68 x 10-44 N/C
114.

A repelling force occurs between two charged objects when the charges are of

a)

unlike signs

b)

like signs

c)

equal magnitude

d)

unequal magnitude

115.

An attracting force occurs between two charged objects when the charges are of

a)

unlike signs

b)

like signs

c)

equal magnitude

d)

unequal magnitude

116.

Electric charge is

a)

found only in a conductor

b)

conserved

c)

found only in insulators

d)

not conserved

117.

Which sentence best describes electrical conductors?

a)

electrical conductors have low mass density

b)

electrical conductors have high tensile strength

c)

electrical conductors have electric charges that move freely

d)

electrical conductors have poor heat conductors

118.

The process of charging a conductor by bringing it near another charged object and then grounding the conductor is called

a)

contact charging

b)

induction

c)

polarization

d)

neutralization

119.

In the diagram shown above, the circles represent small balls that have electric charges. Ball 1 has a negative charge, and ball 2 is repelled by ball 1. Next, you see that ball 2 repels ball 3 and that ball 3 attracts ball 4. What is the electric charge on ball 4?

a)

ball 4 may have either a positive or negative charge

b)

ball 4 has a negative charge

c)

ball 4 has a positive charge

d)

it is not possible to determine the charge on ball 4

120.

The figure shown above demonstrates charging by

a)

grounding

b)

induction

c)

polarization

d)

contact

121.

Two point charges, initially 2 cm apart, are moved to a distance of 10 cm apart. By what factor does the resulting electric force between them change?

a)

25

b)

5

c)

1/5

d)

1/25

122.

Which is the most correct statements regarding the drawing of electric field lines?

a)

electric field lines always connect from one charge to another

b)

electric field lines always form closed loops

c)

electric field lines can start on a charge of either polarity

d)

electric field lines never cross each other

123.

Electric field strength depends on

a)

charge and distance

b)

charge and mass

c)

Coulomb constant and mass

d)

elementary charge and radius

124.

Resultant force on a charge is the ______ sum of the individual forces on that charge.

a)

scalar

b)

vector

c)

individual

d)

negative

125.

Which of the following most closely resembles an electromagnetic?

a)
b)
c)
d)
126.

1. Two charges 3x 10−510^{-5}  C and 5x 10410^4   C are placed at a distance 10 cm from each other. Find the value of electrostatic force acting between them.

a)

 13.5×101113.5\times10^{11} N 

b)

 40 × 101140\ \times\ 10^{11^{ }}  

c)

 180×109180\times10^9  

d)

 13.5×101013.5\times10^{10}  

127.

What is the S. I. unit of electric flux?

a)

NCm2\frac{N}{C}m^2

b)

Nm2C2\frac{N}{m^2}C^2

c)

N m2N\ m^2

d)

Nm2C\frac{N}{m^2}C^{ }

128.

What is the value of minimum force acting between two charges placed at 1 m apart from each other

a)

K eK\ e

b)

K e2K\ e^2

c)

Ke4\frac{Ke}{4}

d)

Ke29\frac{Ke^2}{9}

129.

A glass rod acquires charge by rubbing it with silk cloth. The charge on glass rod is due to :

a)

Conduction

b)

Induction

c)

Radiation

d)

Friction

130.

For a point charge, the graph between electric field versus distance is given by :

a)
b)
c)
d)
131.

What will be the value of electric field at the centre of the electric dipole : -

a)

Zero

b)

Equal to the electric field due to one charge at centre

c)

Twice the electric field due to one charge at centre

d)

half the value of electric field due to one charge at centre

132.

Electric field lines contracts lengthwise, It shows

a)

repulsion between same charges

b)

Attraction between apposite charges

c)

No relation between force & contraction.

d)

Electric field lines does not moves on straight path.

133.

On charging a neutral Balloon its size -

a)

Increases

b)

Decreases

c)

Remains same

d)

No relation between charge & size

134.

Charge Q is kept in a sphere of 5 cm first than it is kept in a cube of side 5 cm. the outgoing flux will be-

a)

More in case of sphere

b)

More in case of cube

c)

Same in both cases

d)

None of the above

135.

Which Quantity is vector Quantity among the following -

a)

Electric flux

b)

Electric field Intensity

c)

Electric Potential

d)

Electric charge

136.

What is the S. I. unit of electric flux?

a)

 Nm2C−1Nm^2C^{-1}  

b)

 NmC−1NmC^{-1}  

c)

 Nm−2C2Nm^{-2}C^2  

d)

 NmC−2NmC^{-2}  

137.

Three charges, each of value Q, are placed at the vertex of an equilateral triangle. A fourth charge q is placed at the centre of the triangle. If the charges remains stationery then, q = ______

a)

 Q/√2Q/√2  

b)

 −Q/√3-Q/√3  

c)

 −Q/√2-Q/√2  

d)

 Q/√3Q/√3  

138.
What is the name of this device that is used to detect charges?
a)
beaker
b)
electroscope
c)
van de graff generator
d)
chargometer
139.

What must be the charge of the two particles and how do you know?

a)

They are both positive, the electric field lines repel each other and are heading out of the charges

b)

They are both positive, field lines repel each other and are heading toward the charges

c)

They are both negative, field lines repel each other and are heading out of the charges

d)

They are both negative, field lines repel each other and are heading toward the charges

140.

Equal charges ‘q’ are placed at the vertices A and B of an equilateral triangle ABC of side ‘a’. The magnitude of electric field at the point C is

a)

Kq/a2Kq/a^2

b)

√2Kq/a2√2Kq/a^2

c)

√3Kq/a2√3Kq/a^2

d)

3Kq/a23Kq/a^2

141.

The dimensional formula of electric charge is

a)

M0L0T1A1M^0L^0T^1A^1

b)

M0L0T−1A1M^0L^0T^{-1}A^1

c)

M0L0T1A−1M^0L^0T^1A^{-1}

d)

M0L0T−1A−1M^0L^0T^{-1}A^{-1}

142.

Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is

a)

Zero

b)

along the diagonal AC

c)

along the diagonal BD

d)

perpendicular to side AB

143.

The graph shows the relationship between the force of interaction and the magnitude of charge. What type of relationship is this?

a)

Direct

b)

Indirect

c)

Inverse

d)

Reverse

144.

The image shows two charged particles with a force of 2.4 N. What would you predict the force of interaction would be when the magnitude of charge on q2 doubles?

a)

9.6 N

b)

4.8 N

c)

1.2 N

d)

.6 N

145.

Before the balloons and sweaters are rubbed together, both objects are __________ charged. After they are rubbed together the sweater is __________ charged and the balloon is ___________ charged

a)

negative/positive/negative

b)

neutral/positive/negative

c)

positive/negative/neutral

d)

neutral/negative/positive

146.

Which picture correctly shows how the atoms in an insulator polarize when a positively-charged plate is brought nearby?

a)
b)
c)
d)
147.
The SI unit of charge is
a)
the ampere
b)
the newton
c)
the coulomb
d)
the joule
148.

A neutral electroscope is charged by bringing a negative rod next to it, then touching it.

a)

A

b)

B

c)

C

d)

D

e)

E

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