Q.

An electromagnetic wave is travelling to the east. At one instant at a given point its E→  points straight up. What is the direction of B→ ?

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a

North

b

Down

c

East

d

South

answer is D.

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Detailed Solution

The direction of propagation of electromagnetic wave is given by n^=E→×B→E→×B→.As per the given condition, the direction of magnetic field vector will be along south
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