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 Equation has a charge Equation . 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

Question number: 2

» Electrostatics » Capacitors

Appeared in Year: 2009

MCQ▾

Question

Consider two situations: (a) A capacitor of capacitance Equation is changed by a battery of volatge Equation , 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 Equation and Equation denote the electrostatic energies in the two situations. Which of the following is true?

Choices

Choice (4) Response

a.

Equation and Equation decrease.

b.

Equation increases while Equation decreases.

c.

Equation and Equation increase.

d.

Equation increases while Equation decreases.

Question number: 3

» Electrostatics » Electric Field Lines

Appeared in Year: 2014

MCQ▾

Question

A positive point charge Equation 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.

Electric force lines enter in solid : Choice – A

Electric Force Lines Enter in Solid: Choice – A

In figure electric force lines enter in solid is shown

b.

Electric force lines enter in solid : Choice – B

Electric Force Lines Enter in Solid: Choice – B

In figure electric force lines enter in solid is shown

c.

Electric force lines enter in solid : Choice – C

Electric Force Lines Enter in Solid: Choice – C

In figure electric force lines enter in solid is shown

d.

Electric force lines enter in solid : Choice – D

Electric Force Lines Enter in Solid: Choice – D

In figure electric force lines enter in solid is shown

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