A plane e.m. wave of frequency 30 MHz travels in free space along the x - direction. The electric field component of the wave at a particular point of space and time is `E=6Vm^(-1)` along y - direction. Its magnetic field component B at this point would be

Options

A. `2xx10^(-8)T" along z - direction."`
B. `6xx10^(-8)T" along z - direction."`
C. `2xx10^(-8)T" along z - direction."`
D. `6xx10^(-8)T" along z - direction."`

Answer

A

Explanation

`B=(E )/(c )=(6)/(3xx10^(8))=2xx10^(-8)T`. Moreover, wave is propagating along x - direction and `vecE` is along the y - direction. Hence, `vecB` must be along z- direction.