A plane electromagenic wave having a frequency `v= 23.9 GHz` propagates along the positive z-direction in free space. The peak value of the Electric field is `60 V//m` Which among the following is the acceptable magnetic field component in the electromagnetic wave ?

Options

A. `vecB=60 sin (0.5xx10^(3)x+1.5+10^(11)t)hatk`
B. `vecB=2xx10^(7)sin(0.5xx10^(3)z+1.5xx10^(11)t)hati`
C. `vecB=2xx10^(-7)sin(1.5xx10^(2)x+0.5xx10^(11)t)hatj`
D. `vecB=2xx10^(-7)sin(0.5xx10^(3)z-1.5xx10^(11)t)hati`

Answer

D

Explanation

Directiion of propagation +z-axis
`B_(0)=(E_(0))/C=2xx10^(-7)T`
So only choice option 4.