Electromagnetic Theory (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 29 - 31 of 68

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Question number: 29

» Electromagnetic Theory » Diffraction

Appeared in Year: 2014

MCQ▾

Question

When laser light of wavelength Equation 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 Equation to – (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 30

» Electromagnetic Theory » Laplace and Poisson Equations

Appeared in Year: 2011

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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 Equation normal to the plane of the ring. Identify the incorrect statement. (December)

Choices

Choice (4) Response

a.

The current density Equation and Equation are related by the equation Equation where Equation 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 Equation

d.

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

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