Electromagnetic Theory (CSIR Physical Sciences): Questions 14 - 16 of 57

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Question number: 14

» Electromagnetic Theory » Reflection and Refraction

Appeared in Year: 2011

MCQ▾

Question

In a Young’s double slit interference experiment, the slits are at a distance 2L from each other and the screen is at a distance D from the slits. If a glass slab of refractive index μ and thickness d is placed in the path of one of the beams, the minimum value of d for the central fringe to be dark is – (December)

Choices

Choice (4) Response

a.

λD(μ1)L

b.

λ2(μ1)

c.

λμ1

d.

λD(μ1)D2+L2

Question number: 15

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

Appeared in Year: 2012

MCQ▾

Question

Four charges (two + q and two –q) are kept fixed at the four vertices of a square of side a as shown

Four charges kept at vertices of a square

Four Charges Kept at Vertices of a Square

In figure four charges (two + q and two –q) are kept fixed at the four vertices of a square of side a.

At the point P which is at a distance R from the centre (Ra) , the potential is proportional to – (December)

Choices

Choice (4) Response

a.

1R4

b.

1R2

c.

1R

d.

1R3

Question number: 16

» Electromagnetic Theory » Polarization

Appeared in Year: 2011

MCQ▾

Question

Consider three polarizers P1,P2andP3 placed along an axis as shown in the figure.

A beam of light passing through polarizers

A Beam of Light Passing Through Polarizers

In figure a beam of unpolarized light of intensity I0 is passing through three polarizers.

The pass axis of P1 and P3 are at right angles to each other while the pass axis of P2 makes an angle θ with that of P1. A beam of unpolarized light of intensity I0 is incident on P1 as shown. The intensity of light emerging from P3 is – (December)

Choices

Choice (4) Response

a.

I04sin22θ

b.

I08sin22θ

c.

0

d.

I02

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