Question

18. Direction of poynting vector is same as direction of
(1)E
(2) B
(3) E + B
(4) Propagation of light​

Answer 1

(3) E + B

In general the Poynting vector is the in the direction in which the wave propagates. ... Now the direction of propagation can for instance be in the direction of the negative z axis, which would yield a 'negative' vector.

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