# Electromagnetic Theory (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 28 - 31 of 68

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## Question number: 28

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2014

MCQ▾

### Question

A non – relativistic particle of mass and charge moving with a velocity and acceleration, emits radiation of intensity. What is the intensity of the radiation emitted by a particle of mass charge, velocity and acceleration? (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 29

» Electromagnetic Theory » Diffraction

Appeared in Year: 2014

MCQ▾

### Question

When laser light of wavelength falls on a metal scale with 1 mm engravings at a grazing angle of incidence, it is diffracted to from a vertical chain of diffraction sports on a screen kept perpendicular to the scale. If the wavelength of the laser is increase by 200 nm, the angle of the first – order diffraction spot changes from to – (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 30

» Electromagnetic Theory » Laplace and Poisson Equations

Appeared in Year: 2011

MCQ▾

### Question

The electrostatic potential in free space in a region where the charge density is zero is given by. Given that the – component of the electric field, and V are zero at the origin, is – (June)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 31

» Electromagnetic Theory » Electromagnetic Induction

Appeared in Year: 2014

MCQ▾

### Question

A superconducting ring carries a steady current in the presence of a magnetic field normal to the plane of the ring. Identify the incorrect statement. (December)

### Choices

Choice (4) Response

a.

The current density and are related by the equation where is a constant.

b.

The current and the magnetic field in the superconductor are time independent.

c.

The flux passing through the superconductor is quantized in unit of

d.

The superconductor shows an energy gap, which is proportional to the transition temperature of the superconductor.

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