The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.724 W/m2. What is the maximum value of the magnetic field in the wave?
(c = 3.0 × 108 m/s,
?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 77.9 nT
B) 55.1 nT
C) 38.9 nT
D) 108 nT
E) 156 nT
A
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