Electrostatic Potential and Capacitance Test

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Electrostatic Potential and Capacitance Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The shape of equipotential surface for an infinite line charge is:

A
None of above

B
Coaxial cylindrical surfaces

C
Parallel plane surfaces

D
Parallel plane surfaces perpendicular to lines of force

Solution

The shape of equipotential surface for an infinite line charge is coaxial cylindrical.
Question 2
1 / -0

A dielectric develops a _____in an external electric field.

A
net dipole moment

B
zero dipole moment

C
zero charge separation

D
positive charge

Solution

Due to charge separation, a net dipole moment is created.
Question 3
1 / -0

Equal charges are given to two spheres of different radii. The potential will

A
be more on the smaller sphere

B
be more on the bigger sphere

C
be equal on both the spheres

D
depend on the material of the sphere

Solution

V=kq/r, so the sphere will smaller radius has a greater potential.
Question 4
1 / -0

The work done in moving a charge of 1C between two points on an equipotential surface is

A
1 J

B
9 × 10^-9 J

C
Zero

D
1.6 × 10^-19J

Solution

There is no potential difference between any two points on the equipotential surface and no work is required to move a test charge on the surface.
Question 5
1 / -0

Dielectrics are

A
Conducting materials

B
Insulators

C
Semiconductors

D
Superconductors

Solution

Dielectrics are non-conducting materials because they have no free charge carriers.
Question 6
1 / -0

It requires 4 J of work to move a charge of 20 C from point A to point B, separated by a distance of 0.2 cm. The potential difference between A and B in volts

A
80

B
16

C
5

D
0.2

Solution

It requires 4 J of work to move a charge of 20 C from point A to point B, separated by a distance of 0.2 cm. The potential difference between A and B in volts

W = 4J

q = 4J

Work done = charge × potential difference

4 = 20 × potential difference

potential difference = 4 /20 = 0.2
Question 7
1 / -0

Optical analogue of an equipotential surface is

A
Wave motion of light

B
Wavefront of light

C
Interference of light

D
Reflection of light

Solution

Wavefronts are surfaces of constant phase. Similarly, equipotential surface due to point charge is spherical in shape and has same potential at each point on selected surface.
Question 8
1 / -0

When a positive charge is moved in an electrostatic field from a point at high potential to a low potential, its kinetic energy

A
Decreases

B
Increases

C
Remains constant

D
Either increase or remain constant

Solution

As a positive charge moves down the potential gradient, its kinetic energy increases.

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Electrostatic Potential and Capacitance Test - 3

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Electrostatic Potential and Capacitance Test - 3

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Question 1

None of above

Coaxial cylindrical surfaces

Parallel plane surfaces

Parallel plane surfaces perpendicular to lines of force

Solution

Question 2

net dipole moment

zero dipole moment

zero charge separation

positive charge

Solution

Question 3

be more on the smaller sphere

be more on the bigger sphere

be equal on both the spheres

depend on the material of the sphere

Solution

Question 4

1 J

9 × 10-9 J

Zero

1.6 × 10-19 J

Solution

Question 5

Conducting materials

Insulators

Semiconductors

Superconductors

Solution

Question 6

80

16

5

0.2

Solution

Question 7

Wave motion of light

Wavefront of light

Interference of light

Reflection of light

Solution

Question 8

Decreases

Increases

Remains constant

Either increase or remain constant

Solution

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9 × 10^-9 J

1.6 × 10^-19J