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Electrostatics Review

Total questions: 76

Worksheet time: 2hrs 53mins

Name
Class
Date
1.
What types of charges attract?
a)
Positive and Positive
b)
Positive and Neutral
c)
Negative and Neutral
d)
Positive and Negative
2.
The accumulation of excess electric charge on an object is called
a)
Static electricity 
b)
Electric discharge
c)
Resistance
d)
Circuit 
3.
Electric charges that are alike _______ each other.
a)
Attract
b)
Repel
4.
Electric charges that are different _______ each other.
a)
Attract
b)
Repel
5.
What charge does a proton have?
a)
negative (-)
b)
positive (+)
c)
neutral or no charge (0)
6.
What charge does an electron have?
a)
negative (-)
b)
positive (+)
c)
neutral or no charge (0)
7.
If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?
a)
A positive charge.
b)
A negative charge.
c)
A neutral charge
d)
No charge at all
8.
What is the major difference between static electricity and current electricity?
a)
Current electricity involves a continuous flow of neutrons; static electricity is a sudden transfer of protons
b)
Current electricity can be deadly; static electricity is almost always safe
c)
In current electricity, there's a single transfer of electrons; in static electricity, there's a steady flow of electrons
d)
Current electricity involves a flow of electrons; static electricity involves a single transfer of electrons
9.
What happens when you touch a metal doorknob after rubbing your shoes on the carpet?
a)
The doorknob sends a burst of electric current into your body
b)
Millions of electrons go from your finger into the doorknob
c)
The doorknob sends millions of electrons into your finger
d)
our finger becomes negatively charged
10.
Which of the following is caused by static electricity?
a)
a stove getting hot when it is turned on
b)
a magnet being attracted to a refrigerator
c)
a lightning strike during a storm
d)
a light bulb coming on when a switch is turned on
11.
True or False, Lighting is a form of static electricity.
a)
True
b)
False
12.

What is static electricity caused by?

a)

A balance of power.

b)

A balance of positive and negative charges.

c)

An imbalance of positive and negative charges.

d)

An imbalance of protons and neutrons.

13.

What can you infer about any object that gives you a static shock when you touch it?

a)

It's a conductor.

b)

It's an insulator.

c)

It's negatively charged.

d)

It's positively charged.

14.
Lightning occurs because ___. 
a)
the negative charges at the bottom of clouds are attracted to the positive charges on the ground.
b)
the positive charges at the bottom of clouds are attracted to the negative charges on the ground.
c)
the positive and negative charges inside clouds are attracted to each other
d)
All of these reasons are correct.
15.
Ms Jo Jo rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?
a)
The balloons will repel each other.
b)
The balloons will attract each other.
c)
The balloons will become positively (+) charged.
d)
The balloons will pop.
16.
Walking across a carpet is an example of charge being transferred by
a)
friction.
b)
induction.
c)
contact.
d)
static electricity
17.
A charged balloon is brought near an electroscope but DOES NOT touch the electroscope.  This is an example of charging by
a)
Conduction
b)
Convection
c)
Friction
d)
Induction
18.

If a negatively charged rod touches a conductor, the conductor will be charged by what method?

a)

Friction

b)

Contact

c)

Induction

d)

Convection

19.
When is the electrostatic force between two charges the strongest?
a)
When charges are very close to each other
b)
When charges are very far apart from each other
c)
When the electric field is constant
20.
Rubbing a balloon through dry hair gives the balloon a _____ electric charge.
a)
positive
b)
negative
c)
neutral
d)
balanced
21.

How many electrons have been removed from a positively charged electroscope if it has a net charge of 7.5x10-11 C?

a)

7.5x10-11 electrons

b)

2.1x10-9 electrons

c)

1.2x108 electrons

d)

4.7x108 electrons

22.
Objects become electrically charged as a result of the transfer of
a)
protons.
b)
electrons.
c)
neutrons.
d)
nuclei.
23.
The nucleus of an atom has _____ electric charge.
a)
a positive
b)
a negative
c)
a neutral
d)
both positive or negative
24.
Uncharged objects can be attracted by a charged object because the uncharged objects acquire a surface charge by the process of
a)
contact.
b)
polarization.
c)
conduction.
d)
charge transfer.
25.
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.
26.
What happens when a rubber rod is rubbed with a piece of fur, giving it a negative charge?
a)
Protons are removed from the rod.
b)
Electrons are added to the rod.
c)
Electrons are added to the fur.
d)
The fur is left neutral.
27.
A plastic rod is rubbed with a dry piece of cloth and the rod becomes positively charged.  The rod has …  
a)
gained electrons
b)
lost electrons
c)
gained protons
d)
lost protons
28.
Charging by ____ occurs when electrons are transferred from one object to another by direct contact.
a)
reduction
b)
induction
c)
conduction
d)
friction
29.
A region around a charged particle that can exert a force on another charged particle is called an
a)
electric pulse.
b)
electric charge.
c)
electric force.
d)
electric field.
30.
The "Q" in Coulomb's Law stands for
a)
the mass of charges objects.
b)
the distance of charged objects.
c)
the force of charged objects.
d)
the charge of charged objects.
31.
Force between two bodies having charges 5.0 x 102 μC and 1.0 x 102 μC separated by distance of 0.50 m in air is
a)
1800 N
b)
1.0 x 103 N
c)
2200 N
d)
3.0 x 102 N
32.
When you pull a cotton sweater off your skin, electrons are transferred from the ___________________ (cotton, skin) to the __________________ (cotton, skin). As a result, your body acquires a ___________ (+ , -) charge and the cotton sweater acquires a ___________ (+ , -) charge.
a)
skin, cotton, +, -
b)
cotton, skin, +, -
c)
skin , cotton, -, +
d)
cotton, skin, -, +
33.
Which part of Coulomb's Law is always squared?
a)
distance
b)
charge
c)
Coulomb's constant
d)
force
34.
Electric field lines are drawn
a)
In a radial direction, from negative to positive.
b)
In a radial direction, from positive to negative.
c)
In a tangent direction, from positive to negative.
d)
In a tangent direction, from negative to positive.
35.
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
36.
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
37.
At which point is the electric field the strongest
a)
A
b)
B
c)
C
d)
D
38.
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
39.
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)
-,-
40.
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
41.
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
42.
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
43.

The force between two point charges is F when they are separated by a distance r. If the separation is increased to 3r what is the force between the charges?

a)

F/3r

b)

F/9r

c)

F/3

d)

F/9

44.

The diagram shows two charged particles.. They exert an electrostatic force, F, on each other. Each particle is then given an additional charge +Q and their separation is increased to 2d. What then becomes the force that acts between the two particles?

a)

an attractive force of F/4

b)

a repulsive force of F/4

c)

an attractive force of F/2

d)

a repulsive force of F/2

45.
Which statement is incorrect?
a)
The direction of electric field lines represents the direction that a positive charge would move in the field.
b)
The distance between the lines represents the strength of the field.
c)
The closer the field lines are, the weaker the field.
d)
An electric field is a region where a charged particle will experience a force
46.
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
47.
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
48.

Which of the following statements is TRUE?

a)

Gravitational forces are attractive and repulsive.

b)

Gravitational forces are stronger than electrical forces.

c)

Electrical forces are attractive only.

d)

Electrical forces are stronger than Gravitational forces

49.

When two objects made of different materials are rubbed together, one object gains electrons and the other object gains protons.

a)

True: Protons and Electrons are transferred back and forth.

b)

False: The materials must be the same for electrons to be transferred.

c)

False: Only electrons are transferred when objects are rubbed together.

d)

False: One object loses electrons and the other loses protons.

50.

An object that is negatively charged must have ______________ electrons compared to its protons.

a)

more

b)

less

51.

An object that is positively charged must have _____________ electrons compared to its protons.

a)

more

b)

less

52.

What is the magnitude of the force between the two charged spheres shown? (Hint: You do not need to convert the units.)

a)

1.6

b)

1.4

c)

1.2

d)

1.0

53.
Charged objects are not attracted to neutral objects
a)
True
b)
False
54.

What direction are the electric field lines around a proton?

a)

towards the charge

b)

away from the charge

55.

A 5 C and 8 C are 8 m apart. What is the force between them?

a)

5.625 x 109

b)

5.625 x 10-9

c)

4.5 x 1010

d)

4.5 x 10-10

56.

A repulsive force exists between which two particles?

a)

Two neutrons

b)

An electron and a neutron

c)

An electron and a proton

d)

Two electrons

57.

Which two particles are attracted to each other?

a)

Two neutrons

b)

A proton and an electron

c)

Two protons

d)

An electron and a neutron

58.

How is the electric force between two charges affected when both of the charges are cut in half?

a)

decreases four times

b)

no change

c)

increase four times

d)

increases 2 times

59.

If the distance is reduced by 1/4, what happens to the force?

a)

16 times

b)

Reduces by a fourth

c)

no change

d)

Reduces by half

60.

A charge of 4 C and -7 C are 200 m apart. What is the force between them?

a)

6.3 x 106

b)

-6.3 x 106

c)

2.52 x 1011

d)

-2.52 x 1011

61.

Coulomb's law says that the force between any two charges depends

a)

directly on the size of the charges

b)

inversely on the square of the distance between the charges

c)

both are correct

62.

What is the electric force between a 2.5 C charge and a negative 1 C charge when they are separated by a distance of 20 m?

a)

1,125,000,000 N

b)

56,250,000 N

c)

0.125 N

d)

0.00625 N

63.
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
64.
If the distance doubles, what happens to the force?
a)
Reduced by half
b)
Reduced by 1/4
c)
Stays the same
d)
Quadruples
65.
If each of the charges doubles, what happens to the force?
a)
Quadruples
b)
Doubles
c)
Stays the same
d)
Reduced by half
66.
If the distance is reduced by half, what happens to the force?
a)
Quadruples
b)
Doubles
c)
Triples
d)
Reduces by half
67.
What is the magnitude of the electrostatic force that a charge of +3.0 X 10-5 coulomb exerts on a charge of +6.0 X 10-6 coulomb that is 0.30 meter away?
a)
1.8 X 10-3 N
b)
5.4 X 10-2 N
c)
5.4 X 100 N
d)
1.8 X 101 N
68.
A negative charge q1 = -7.4 μC is located at a point X1 = -9.0 m, a negative charge q2 = -9.7 μC is located at a point X2 = -3.0 m and a positive charge q3 = 2.1 μC is located at a point X3 = 1.0 m.
What does the free body diagram for q1 look like?
a)
<----<----⊖
b)
⊖---->---->
c)
<----⊖---->
d)
---->⊖<----
69.
A negative charge q1 = -7.4 μC is located at a point X1 = -9.0 m, a negative charge q2 = -9.7 μC is located at a point X2 = -3.0 m and a positive charge q3 = 2.1 μC is located at a point X3 = 1.0 m.
What does the free body diagram for q2 look like?
a)
<----<-----⊖
b)
⊖---->---->
c)
<----⊖---->
d)
---->⊖<----
70.
A negative charge Q1 = -7.4 μC is located at a point X1 = -9.0 m, a negative charge Q2 = -9.7 μC is located at a point X2 = -3.0 m and a positive charge Q3 = 2.1 μC is located at a point X3 = 1.0 m.
What is the magnitude of the force between q1 and q2?
a)
1.79 x 10-2 N
b)
2.25 x 10-2 N
c)
2.57 x 10-2 N
d)
2.79 x 10-2 N
71.
A negative charge Q1 = -7.4 μC is located at a point X1 = -9.0 m, a negative charge Q2 = -9.7 μC is located at a point X2 = -3.0 m and a positive charge Q3 = 2.1 μC is located at a point X3 = 1.0 m.
What is the magnitude of the force between q1 and q3?
a)
1.39 x 10-3 N
b)
2.25 x 10-2 N
c)
2.57 x 10-3 N
d)
2.79 x 10-2 N
72.
Two charged objects exert an electrical force of attraction of F on each other. The charge on one of the objects is quadrupled, and the charge on the other object is doubled. What is the new force of attraction on the objects?
a)
1/2 F
b)
2F
c)
6F
d)
8F
73.
a)
doubling q1 only
b)
doubling d, q1, and q2
c)
doubling d and q1 only
d)
doubling d only
74.
Which of the following procedures will double the force on two point charges?
a)
halving the distance between the charges   
b)
doubling the magnitude of one charge
c)
halving the magnitude of one charge
d)
doubling the distance between the charges
75.
The electrostatic force on two positive point charges is F when the charges are 0.1 meter apart. When these point charges are placed 0.05 meter apart, what is the new electrostatic force on them?
a)
4F, and repelling
b)
4F, and attracting
c)
F, and attracting
d)
F, and repelling
76.
The magnitude of the electrostatic force on two point charges is F. The distance between the charges is doubled. What is the new magnitude of the electrostatic force on the charges?
a)
1/4 F
b)
1/2 F
c)
2F
d)
4F

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