Frequency of electromagnetic wave is 25MHz. The value of electric field intensity at any point at any time in wave in wave is `6.3 Vm^(-1)`. The value of magnetic field at that point is …… `Wb//m^(2)`.

Options

A. `3.9xx10^(-2)`
B. `2.52xx10^(-7)`
C. `2.1xx10^(-8)`
D. `7.5xx10^(-3)`

Answer

C

Explanation

Velocity of electromagnetic wave is `3xx10^(8)m//s`
`therefore c=(E )/(B)`
`therefore B=(B)/(c )=(6.3)/(3xx10^(8))`
`therefore B=2.1xx10^(-8)T`