Electrostatics

1.

The capacity of a parallel plate capacitor with no dielectric substance but with a separation of 0.4 cm is 2 μF. The separation is reduced to half and it is filled with a dielectric substance of value 2.8. The final capacity of the capacitor is: CBSE PMT 2000

A.

15.6 μF

B.

19.2 μF

C.

22.4 μF

D.

11.2 μF

Ans. A B C D

Correct answer: Option D

2.

If the potential of a capacitor having capacity 6 µF is increased from 10 V to 20 V, then increase in its energy will be __________. CBSE AIPMT 1995

A.

9 × 10 ^-4 J

B.

4 × 10 ^-4 J

C.

4 × 10 ^-14 J

D.

12 × 10 ^-6 J

Ans. A B C D

Correct answer: Option A

3.

A spherical conductor of radius 10 cm has a charge of 3.2 × 10–7 C distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere? NEET 2020

A.

1.28 × 10⁶ N/C

B.

1.28 × 10⁵ N/C

C.

1.28 × 10⁷ N/C

D.

1.28 × 10⁴ N/C

Ans. A B C D

Correct answer: Option B

4.

A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will __________. CBSE AIPMT 2011

A.

remain the same

B.

be reduced to half

C.

be doubled

D.

increase four times

Ans. A B C D

Correct answer: Option A

5.

A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system __________. NEET 2017

A.

increases by a factor of 4

B.

remains the same

C.

increases by a factor of 2

D.

decreases by a factor of 2

Ans. A B C D

Correct answer: Option C

6.

An electric dipole is placed at an angle of 30° with an electric field intensity 2.0 × 10⁵ N/C. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is: AIPMT 2016

A.

2 mC

B.

8 mC

C.

7 μC

D.

5 mC

Ans. A B C D

Correct answer: Option A

7.

Two metallic spheres of radii 1 cm and 3 cm are given charges of –1 × 10^-2 C and 5 × 10^-2 C, respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is: AIPMT 2012

A.

4 × 10^-2 C

B.

2 × 10^-2 C

C.

3 × 10^-2 C

D.

1 × 10^-2 C

Ans. A B C D

Correct answer: Option C

8.

An electric dipole of moment p is lying along a uniform electric field E. The work done in rotating the dipole by 90° is __________. CBSE AIPMT 2006

A.

pE

B.

√2pE

C.

pE/2

D.

2pE

Ans. A B C D

Correct answer: Option A

9.

If the distance between parallel plates of a capacitor is halved and dielectric constant is doubled then the capacitance: CBSE PMT 2002

A.

Increases two times

B.

Increases four times

C.

Remain the same

D.

Decreases two times

Ans. A B C D

Correct answer: Option B

10.

A capacitor of 20 μF is charged to 500 volts and connected in parallel with another capacitor of 10 μF and charged to 200 volts. The common potential is: CBSE PMT 2000

A.

500 volts

B.

200 volts

C.

300 volts

D.

400 volts

Ans. A B C D

Correct answer: Option D

Test set 1

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