試題詳解

15. If the peak electric field in an electromagnetic wave is 1200 V/m , what is the peak magnetic field for the same wave?
(A)2.2×10⁻⁶T 
(B)3.4×10⁻⁶T 
(C)4.0 ×10⁻⁶T
(D)8.7×10⁻⁶T 
(E)9.6×10⁻⁶T