The amplitude of the sinusoidially oscillating electric field of a plane wave is 60 V/m. Then the amplitude of magnetic field is :

Options

A. `2 times 10^(2)T`
B. `6 times 10^(7)T`
C. `6 times 10^(2)T`
D. `2 times 10^(-7)T`

Answer

D

Explanation

The instantaneous magnitudes of electric field (E) and magnetic field (B) are related as
`" "E/B=c`
`rArr" "B=E/c`
Given, `E=60V/m, c=3 times 10^(8)m//s`.
`therefore" "B=60/(3 times 10^(8))=2 times 10^(-7)T`