In Vacuum,the Components of an EM Wave Are E_y = $\omega$

In vacuum,the components of an EM wave are E_y = 50( V/m ) cos[(5.0 m^-1) x + $\omega$ t], E_x = 0, and E_z = 0.What is the amplitude of the magnetic field for this wave?

A) 5.00 $\times$ 10^-7 T
B) 1.67 $\times$ 10^-7 T
C) 2.00 $\times$ 10^-7 T
D) 1.50 $\times$ 10^-6 T
E) 1.33 $\times$ 10^-6 T

Correct Answer:

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