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Electric Charges & fields

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.

The surface considered for Gauss’s law is called

a)

(a) Closed surface

b)

(b) Spherical surface

c)

(c) Gaussian surface

d)

(d) Plane surface

2.

The total flux through the faces of the cube with side of length a if a charge q is placed at corner A of the cube is 18   ϵo\frac{1}{8\ \ \ \epsilon_o} . Do you agree?

a)

Yes

b)

No

3.

An electric dipole in a uniform electric field experiences (When it is placed at an angle θ\theta   with the field)

a)

Force and torque both

b)

Force but no torque

c)

Torque but no force

d)

No force and no torque

4.

A mass m=20g has a charge q=3.0mC . It moves with a velocity of 20m/s and enters a region of electric field of 80N/C in the same direction as the velocity of the mass. The velocity of the mass after 3 seconds in this region is

a)

80 m/s

b)

56m/s

c)

44m/s

d)

40m/s

5.

QA and QB are two charges creating an electric field. Based on the diagram, what can we say about the strength electric fields coming from QA and QB

4 lines
6.

The diagram above shows a point, P, located midway between two oppositely charged parallel plates.

If an electron is introduced at point P, the electron will

a)

accelerate toward the negatively charged plate

b)

travel at constant speed toward the negatively charged plate

c)

travel at constant speed toward the positively charged plate

d)

accelerate toward the positively charged plate

7.

A uniformly charged conducting sphere of 4 m in diameter has a surface charge density of 100 μCm2\frac{\mu C}{m^2} . Calculate the total electric flux coming out of the sphere

a)

5.6 x 108 Vm

b)

1.4 x 108 Vm

c)

22.4 x 108 Vm

d)

1.1 x 108 Vm

8.

Determine the ratio q1q2\frac{q_1}{q_2} As lines of forces of two point charges are shown in figure

a)

1

b)

2

c)

4

d)

3

9.

Identical charges A, B, and C are located between two oppositely charged parallel plates, as shown in the diagram below. The magnitude of the force exerted on the charges by the electric field between the plates is

a)

least on A and greatest on C

b)

the same on A and C, but less on B

c)

the same for A, B, and C

d)

greatest on A and least on C

10.

A region surrounding a stationary electric dipoles has

a)

Magnetic field only

b)

Electric field only

c)

Both electric and magnetic fields

d)

No electric and magnetic fields

11.

The given diagram shows charges of +2 µC and -2 µC situated at points P and Q respectively. Point X is midway between P and Q.


What is the direction of the electric field and the value of the electric potential at point X?

a)

A

b)

B

c)

C

d)

D

12.

Consider the points lying on a straight line joining two fixed opposite charges. Between the charges there is

a)

No point where electric field is zero

b)

Only one point where electric field is zero

c)

No point where potential is zero

d)

Only one point where potential is zero

13.

Four charges are placed on corners of a square as shown in figure having side of 5cm. If Q is one microcoulomb, then electric field intensity at centre will be

a)

1.02×107 NC upwards 1.02\times10^{7\ }\ \frac{N}{C\ }upwards\

b)

2.04×107 NC downwards 2.04\times10^{7\ }\ \frac{N}{C\ }downwards\

c)

2.04×107 NC upwards 2.04\times10^{7\ }\ \frac{N}{C\ }upwards\

d)

1.02×107 NC downwards 1.02\times10^{7\ }\ \frac{N}{C\ }downwards\

14.

The unit of electric field is not equivalent to

a)

NC\frac{N}{C}

b)

JC\frac{J}{C}

c)

Vm\frac{V}{m}

d)

JC−m\frac{J}{C-m}

15.

Three infinitely long non-conducting charge sheets are placed as shown in figure. The electric field at point P is

a)

2σϵ\frac{2\sigma}{\epsilon} along -ve Z axis

b)

2σϵ\frac{2\sigma}{\epsilon} along +ve Z axis

c)

4σϵ\frac{4\sigma}{\epsilon} along -ve Z axis

d)

4σϵ\frac{4\sigma}{\epsilon} along +ve Z axis

16.

A moving electron is deflected by two oppositely charged parallel plates, as shown in the diagram above.

The electric field between the plates is directed from

a)

C to D

b)

D to C

c)

A to B

d)

B to A

17.

Electric charges of 1 μC\mu C ,-1 μC\mu C and 2 μC\mu C C are placed in air at the corners A,B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C

a)

2.7 N

b)

1.8N

c)

0.9 N

d)

3.6 N

18.

The diagram above shows a point, P, located midway between two oppositely charged parallel plates.

If an electron is introduced at point P, the electron will

a)

accelerate toward the negatively charged plate

b)

travel at constant speed toward the negatively charged plate

c)

travel at constant speed toward the positively charged plate

d)

accelerate toward the positively charged plate

19.

Two charges 1C and -4C exists in air. What is the direction of force?

a)

Away from 1C

b)

Away from -4C

c)

From 1C to -4C

d)

From -4C to 1C

20.

Which of the following is not true for electric field lines?

a)

Tangent to the electric field lines gives the direction of electric field

b)

Two electric field lines can't intersect each other

c)

Electric field lines form closed loops

d)

The closer the electric field lines stronger the electric field

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