Electromagnetic Field Thoery - ECE Questions and Answers

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The intrinsic impedance of free space is

75 ohm

73 ohm

120 ohm

377 ohm

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Pick the odd one out with respect to equipotential surface

Potential is same every where

Work done in moving charge from one point to another is zero

Potential is different every where

No current flows on this surface

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Which of the following matching is incorrect

Ampere's circuital law -

Displacement current density -

Poisson's equation - âˆ‡2 V = 0

Continuity equation -

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A wave is incident normally on a good conductor. If the frequency of a plane electromagnetic wave increases four times, the skin depth will

increase by a factor of 2

decrease by a factor of 4

remain the same

decrease by a factor of 2

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The ratio of conduction current density to the displacement current density is

Ïƒ / j Ï‰âˆˆ

jÏƒ / Ï‰âˆˆ

ÏƒÏ‰ / jâˆˆ

Ïƒ âˆˆ / j Ï‰

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In a travelling electromagnetic wave, E and H vector fields are

Perpendicular in space

Parallel in space

E is in the direction of wave travel

H is in the direction of wave travel

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When two vectors are perpendicular, their

Dot product is zero

Cross product is zero

Both are zero

Both are not necessarily zero

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The cross product of the vectors 3i + 4j “ 5k and “i + j “ 2k is,

3i "“ 11j + 7k

-3i + 11j + 7k

-3i "“ 11j "“ 7k

-3i + 11j "“ 7k

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Which of the following are not vector functions in Electromagnetics?

Gradient

Divergence

Curl

There is no non- vector functions in Electromagnetics