The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 
in SI units. What is the speed of the EM wave?
A. 3 × 108 m/s
B. 100 m/s
C. 106 m/s
D. 2 × 107 m/s
E. 2 × 108 m/s
Answer: A
Physics & Space Science
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C. 
D. 
E. 
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