Electrostatics Test

Result

Electrostatics Test - 46

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Question 1
4 / -1

A
Negative, increase

B
Positive, decrease

C
Negative, decrease

D
Positive, increase
Question 2
4 / -1

A charged particle of mass m and charge q is released from rest in a uniform electric field E. Neglecting the effect of gravity, the kinetic energy of the charged particle after ‘t’ second is

A

B

C

D

Solution
Question 3
4 / -1

A
3.6 × 10⁶ N/C

B
1.8 × 10⁶ N/C

C
Zero

D
0.9 × 10⁶ N/C
Question 4
4 / -1

A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point p a distance R/2 from the centre of the shell is

A

B

C

D

Solution
Question 5
4 / -1

A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown in figure. Let V_A, V_B, V_C be the potentials at points A,B and C respectively. Then

A
V_C > V_B

B
V_B > V_C

C
V_A > V_B

D
V_A = V_C
Question 6
4 / -1

A point charge is kept at the centre of a metallic insulated spherical shell. Then

A
Electric field outside the sphere is zero

B
Electric field inside the sphere is zero

C
Net induced charge on the sphere is zero

D
Electric potential inside the sphere is zero
Question 7
4 / -1

A charge of 10 e.s.u. is placed at a distance of 2 cm from a charge of 40 e.s.u. and 4 cm from another charge of 20 e.s.u. The potential energy of the charge 10 e.s.u. is (in ergs)

A
87.5

B
112.5

C
150

D
250

Solution
Question 8
4 / -1

Identify the wrong statement

A
The electrical potential energy of a system of two protons shall increase if the separation between the two is decreased

B
The electrical potential energy of a proton electron system will increase if the separation between the two is decreased

C
The electrical potential energy of a proton electron system will increase if the separation between the two is increased

D
The electrical potential energy of system of two electrons shall increase if the separation between the two is decreased

Solution
Question 9
4 / -1

A sphere of 4 cm radius is suspended within a hollow sphere of 6 cm radius. The inner sphere is charged to potential 3 e.s.u. and the outer sphere is earthed. The charge on the inner sphere is

A
54 e.s.u.

B
1/4 e.s.u.

C
30 e.s.u.

D
36 e.s.u.

Solution
Question 10
4 / -1

Two positive point charges of 12 and 5 micro-coulombs, are placed 10 cm apart in air. The work needed to bring them 4 cm closer is

A
2.4 J

B
3.6 J

C
4.8 J

D
6.0 J

Solution