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¯