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Q.

An electromagnetic wave in vacuum has the electric and magnetic field E→  and  B→,   which are always perpendicular to each other . The direction of polarization  is given by i^  and that of wave propagation by k^ . Then direction of magnetic field is

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a

-i^

b

j^

c

-k^

d

-j^

answer is B.

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Detailed Solution

B^=c^×E^ ⇒B^=k^×i^=j^
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An electromagnetic wave in vacuum has the electric and magnetic field E→  and  B→,   which are always perpendicular to each other . The direction of polarization  is given by i^  and that of wave propagation by k^ . Then direction of magnetic field is