The amplitude of electric field in an electromagnetic wave is `60 Vm^(-1)` . Then the amplitude of magnetic field is

Options

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

Answer

A

Explanation

Given ,
`E_(0) = 60 V//m`
`E_(0) = ?`
The speed of e.m.wave
`c = (E_(0))/(B_(0))`
`E_(0) = (E_(0))/(c) " "[:.c = 3 xx 10^(8) m//s] `
`= (60)/(3 xx 10^(8)) = 20 xx 10^(-8)`
`= 2 xx 10^(-7) T`