Electrostatics Test

Result

Electrostatics Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

A particle of mass 1 kg and charge 1/3μC is projected towards a non conducting fixed spherical shell having the same charge uniformly distributed on its surface. The minimum initial velocity V₀ of projection of particle required if the particle just grazes the shell is

A

B

C
2/3 ms^-1

D
1 ms^-1

Solution

From conservation of angular momentum,

from conservation of energy,
Question 2
1 / -0

A uniform electric field 100 V/ m is directed vertically downwards. Find the change in potential energy of an electron whose height decreases by 0.5 m.

A
20 eV

B
50 eV

C
30 eV

D
40 eV

Solution

Definition based
Question 3
1 / -0

Negative mutual potential energy corresponds to attraction between two charges

A
False

B
True

C
Can’t predict

D
None of the above

Solution

Definition based
Question 4
1 / -0

The amount of work done in moving a charge from one point to another along an equipotential line or surface charge is

A
Zero

B
Infinity

C
One

D
Two

Solution

Since Potential difference between two points in equipotential surfaces is zero, the work done between two points in equipotential surface is also zero.
Question 5
1 / -0

In bringing an electron towards another electron, the electrostatic potential energy of the system

A
becomes zero

B
decreases

C
remains same

D
increases

Solution

Definition based
Question 6
1 / -0

The potential energy of a system containing only one point charge is

A
Zero

B
Infinity

C
Non zero finite

D
None of the above
Question 7
1 / -0

A proton is accelerated from rest through a potential of 500 volts. Its final kinetic energy is

A
1000 eV

B
500 eV

C
50 eV

D
2000 eV

Solution

K = qV
Question 8
1 / -0

The electrostatic potential energy between two charges q1 and q2 separated by a distance by r is given by

A

B

C

D

Solution

We know that energy required/gained = force x displacement
As F = kqQ / r² and displacement is r
We get U = kQq /r
Where k = 1/4ϵ
Question 9
1 / -0

What is the electrostatic potential energy of a system containing two charges 40 nC and 60 nC at a distance of 36 cm?

A
100 micro J

B
60 micro J

C
120 micro J

D
80 micro J

Solution

Definition based