Electrostatics Test

Result

Electrostatics Test - 47

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Question 1
4 / -1

There are two equipotential surfaces as shown in figure. The distance between them is r. The charge of –q coulomb is taken from the surface A to B, the resultant work done will be

A

B

C

D

Solution
Question 2
4 / -1

When one electron is taken towards the other electron, then the electric potential energy of the system

A
Decreases

B
Increases

C
Remains unchanged

D
Become zero

Solution
Question 3
4 / -1

A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10y. The potential at a distance of 2cm from the centre of the sphere

A
Zero

B
10 V

C
4 V

D
10/3 V
Question 4
4 / -1

The work done in carrying a charge of 5µC from a point A to a point B in an electric field is 110 mJ. The potential difference (V_B – V_A) is then

A
+2kV

B
–2kV

C
+200 V

D
–200V

Solution
Question 5
4 / -1

Value of potential at a point due to a point charge is

A
Inversely proportional to square of the distance

B
Directly proportional to square of the distance

C
Inversely proportional to the distance

D
directly proportional to the distance

Solution
Question 6
4 / -1

Electric potential of earth is taken to be zero because earth is a good

A
Insulator

B
Conductor

C
Semiconductor

D
Dielectric
Question 7
4 / -1

Two parallel plates separated by a distance of 5 mm are kept at a potential difference of 50 V A particle of mass 10^–15 kg and charge 10^–11C enters in it with a velocity 10⁷ m/s. The acceleration the particle will be

A
10⁸ m/s²

B
5 × 10⁵ m/s²

C
10⁵ m/s²

D
2 × 10³ m/s²

Solution
Question 8
4 / -1

Three point charges are placed at the corners of an equilateral triangle. Assuming only electrostatic forces are acting

A
The system can never be in equilibrium

B
The system will be in equilibrium if the charges rotate about the centre of the triangle

C
The system will be in equilibrium if the charges have different magnitudes different signs

D
The system will be in equilibrium if the charges have the same magnitudes but different signs
Question 9
4 / -1

If an insulated non-conducting sphere of radius R has charge density ρ. The electric field at a distance r from the centre of sphere (r < R) will be

A

B

C

D

Solution
Question 10
4 / -1

Two plates are at potentials –10 V and +30 V. If the separation between the plates be 2 cm. The electric field between them is

A
2000 V/m

B
1000 V/m

C
500 V/m

D
3000 V/m

Solution