Electromagnetic Theory (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 25 - 27 of 68

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Question number: 25

» Electromagnetic Theory » Electromagnetic Waves in Free Space

Appeared in Year: 2011

MCQ▾

Question

A plane electromagnetic wave is propagating in a lossless dielectric. The electric field is given by , where c is the speed of light in vacuum, , A and are constant and and are unit vectors along the x and z – axes. The relative dielectric constant of the medium, and the constant A are – (June)

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Choice (4) Response

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d.

Question number: 26

» Electromagnetic Theory » Reflection and Refraction

Appeared in Year: 2014

MCQ▾

Question

A plane electromagnetic wave incident normally on the surface of a material is partially reflected. A measurement on the standing wave in the front of the interface shows that the ratio of the electric field amplitude at the maxima and the minima is 5. The ratio of the reflected intensity to the incident intensity is (December)

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Choice (4) Response

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d.

Question number: 27

» Electromagnetic Theory » Scalar and Vector Potentials

Appeared in Year: 2014

MCQ▾

Question

A scalar and vector potential and are determine up to a gauge transformation and , where is an arbitrary continuous and differential function of and . If we further impose the Lorenz gauge condition,

Then a possible choice for the gauge function is – (Where are nonzero constants with ) (December)

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Choice (4) Response

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c.

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