Electrostatics (NEST (National Entrance Screening Test) Physics): Questions 1 - 3 of 4

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Question number: 1

» Electrostatics » Electric Potential

Appeared in Year: 2008

MCQ▾

Question

A spherical mercury droplet of radius has a charge . Twenty-seven such droplets are combined to make one large spherical drop. The ratio of the surface potential of the larger drop to that of each droplet is –

Choices

Choice (4) Response

a.

9

b.

27

c.

1

d.

3

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Question number: 2

» Electrostatics » Capacitors

Appeared in Year: 2009

MCQ▾

Question

Consider two situations: (a) A capacitor of capacitance is changed by a battery of volatge , and the battery is disconnected. (b) The same capacitor is charged is charged by the same battery, which however, is kept connected. Next, in both cases, a thin dielectric slab is inserted between the capacitor plates. (Earlier there was only air). Let and denote the electrostatic energies in the two situations. Which of the following is true?

Choices

Choice (4) Response

a.

and decrease.

b.

increases while decreases.

c.

and increase.

d.

increases while decreases.

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Question number: 3

» Electrostatics » Electric Field Lines

Appeared in Year: 2014

MCQ▾

Question

A positive point charge is placed near a three dimensional isolated, neutral solid conductor with a cavity as shown. The possible electric lines of force are best depicted in:

Choices

Choice (4) Response

a.

b.

c.

d.

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