# Electromagnetic Theory (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 42 - 45 of 68

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## Question number: 42

» Electromagnetic Theory » Reflection and Refraction

Appeared in Year: 2014

MCQ▾

### Question

A beam of light of frequency is reflected from a dielectric – metal interface at normal incidence. The refractive index of the dielectric medium is and that of the metal is . 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.

b.

c.

d.

## Question number: 43

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

Appeared in Year: 2013

MCQ▾

### Question

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

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

### Choices

Choice (4) Response

a.

b.

c.

1

d.

## Question number: 44

» Electromagnetic Theory » Lorentz Invariance of Maxwell's Equation

Appeared in Year: 2012

MCQ▾

### Question

Which of the following quantities is Lorentz invariant? (June)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 45

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2012

MCQ▾

### Question

When a charged particle emits electromagnetic radiation, the electric field and the Poynting vector at a large distance from the emitter vary as and respectively. Which of the following choices for and are correct? (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

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