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Q.

In a region of free space during the propagation of electromagnetic wave, the electric field at some instant of time t is E→=90i^N/C and the magnetic field is B¯=0.08ȷ^μ0T The  poynting vector for these fields at that point is

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a

7.2j^Wm−2

b

7.2k^Wm−2

c

1.2i^Wm−2

d

2.7k^Wm−2

answer is B.

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Detailed Solution

S¯=1μ0[E¯×B¯]=1μ090i^×0.08μ0i=7.2k^
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