The average electric field of electromagnetic waves in certain region of free space is `9 xx 10^(–4) NC^(–1)`. Then the average magnetic field in the same region is of the order of

Options

A. `27xx10^(-4)T`
B. `3xx10^(-12)T`
C. `((1)/(3))xx10^(-12)T`
D. `3xx10^(12)T`

Answer

B

Explanation

`E=9xx10^(-4)NC^(-1)`
For electromagnetic waves, `(E)/(B)=c`, speed of light in vacuum.
`rArr" "(9xx10^(-4))/(B)=3xx10^(8)ms^(-1) or B=3xx10^(-12)T`