The poynting vector of an electromagnetic wave is given by S→=2i^+5j^+4k^. Find the angle which the direction of propagation of the wave makes with z axis
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a
530
b
370
c
450
d
300
answer is B.
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Detailed Solution
If the direction of propagation of the wave makes an angle θ with z axis, cosθ=s→.k^s→=2i^+5j^+4k^.k^4+5+16=45=0.8 ⇒θ=370