Electromagnetic Theory (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 41 - 43 of 57

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Question number: 41

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2014

MCQ▾

Question

An electromagnetically – shielded room is designed so that at a frequency Equation the intensity of the external radiation that penetrates the room is 1 % of the incident radiation. If Equation is the conductivity of the shielding material, its minimum thickness should be –

(Given that Equation ) (June – 2014)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 42

» Electromagnetic Theory » Reflection and Refraction

Appeared in Year: 2014

MCQ▾

Question

A beam of light of frequency Equation is reflected from a dielectric – metal interface at normal incidence. The refractive index of the dielectric medium is Equation and that of the metal is Equation . If the beam is polarized parallel to the interface, then the phase change experienced by the light upon reflection is – (June – 2014)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 43

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

Appeared in Year: 2013

MCQ▾

Question

Let four point charges Equation be placed at the vertices of a square of side Equation . Let another point charge Equation be placed at the centre of the square (see the figure)

4charges placed at the vertices of a square & 1 point at centre

4charges Placed at the Vertices of a Square & 1 Point at Centre

In figure four charges placed at the vertices of a square and one point charge is placed at the centre of the square.

Let Equation be the electrostatic potential at a point P at a distance Equation from the centre of the square. Then Equation is – (December – 2013)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

1

d.

Equation

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