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Question

In an electromagnetic wave, the direction of the magnetic induction B is

A
parallel to the electric field E
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B
perpendicular to the electric field E
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C
antiparallel to the pointing vector S
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D
random
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Solution

The correct option is B perpendicular to the electric field E
Answer: B
The electric field is always perpendicular to the magnetic field, and both fields are directed at right-angles to the direction of propagation of the wave. In fact, the wave propagates in the direction E×B. Electromagnetic waves are clearly a type oftransverse wave.

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