Electromagnetic Theory (CSIR Physical Sciences): Questions 21 - 24 of 57

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Question number: 21

» Electromagnetic Theory » Electrostatics: Gauss's Law and Its Applications

Appeared in Year: 2012

MCQ▾

Question

A point charge q of mass m is kept at a distance d below a grounded infinite conducting sheet which lies in the xy – plane. For what value of d will the charge remains stationary? (December)

Choices

Choice (4) Response

a.

qmgπε0

b.

There is no finite value of d

c.

mgρε0q

d.

q4mgπε0

Question number: 22

» Electromagnetic Theory » Interference

Appeared in Year: 2014

MCQ▾

Question

A parallel beam of light of wavelength λ is incident normally on a thin polymer film with air on both sides. If the film has a refractive index n>1 , then second order bright fringes can be observed in reflection when the thickness of the film is - (December)

Choices

Choice (4) Response

a.

3λ4n

b.

λ2n

c.

λ4n

d.

λn

Question number: 23

» Electromagnetic Theory » Electrostatics: Gauss's Law and Its Applications

Appeared in Year: 2014

MCQ▾

Question

The electrostatic line of force due to a system of four point charges is sketched below.

The electrostatic lines of force

The Electrostatic Lines of Force

In figure the electrostatic line of force due to a system of four point charges is shown.

At a large distance r , the leading asymptotic behaviour of the electrostatic potential is proportional to – (December)

Choices

Choice (4) Response

a.

r3

b.

r

c.

r1

d.

r2

Question number: 24

» Electromagnetic Theory » Dipoles and Retarded Potentials

Appeared in Year: 2011

MCQ▾

Question

The potential of a diatomic molecule as a function of the distance r between the atoms is given by V(r)=ar6+br12 . The value of the potential at equilibrium separation between the atoms is: (December)

Choices

Choice (4) Response

a.

2a2b

b.

a24b

c.

4a2b

d.

a22b

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