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Q.

For plane electromagnetic waves propagating in the z direction, which one of the following combination gives the correct possible direction for E→ and B→field respectively?

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a

-2i^-3j^  and 3i^-2j^

b

3i^+4j^  and 4i^-3j^

c

i^+2j^  and 2i^-j^

d

2i^+3j^  and i^+2j^

answer is A.

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Detailed Solution

E¯⊥B¯ ⇒ E¯.B¯=0-2i^-3j^.3i^-2j^=-6+6=0E→ x B→=i^j^k^-2-303-20         =k^ 4+9=13k^ i.e., along z- axis E¯ x B¯∥C¯
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