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3 C 21551

Section C

Answer any one question.

The question carries 11 marks.

20. Obtain the wave equation for the E and B vectors in free space. Using a plane wave solution show
that the electromagnetic waves are transverse in nature and the E and B vectors are in phase and
mutually perpendicular.

21. Explain the construction and working principle of a ballistic galvanometer. Obtain the relation

connecting the charge flowing and the ballistic throw of the galvanometer.

(1 x 11 = 11 marks)

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