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40. The oscillating magnetic field in a plane
electromagnetic wave is given as
B=6x10-sin(200tex -3x10° tt) T.
The amplitude of electric field is
(1) 1800 V/m
(2) 90 V/m
(3) 900 V/m
(4) 300 V/m
The amplitude of electric field at a distance r from a
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