Question

A plane electromagnetic wave of frequency 25 MHz travels in free space along X direction. At a particular point in space at time E = 6.3jVm-1. What is B at this point?

Answer 1

the formula for this is 2*pi*frequency = E/(B*permeability of free space)

Answer 2

The magnitude of electric and magnetic fields in the electromagnetic wave are related as

$B \: = \: \dfrac{E}{C}$

where, C is speed of light

Given,

E = 6.3

$C \: = \: 3 \times 10 {}^{8}$

$B \: \: = \: \: \dfrac{6.3}{3 \times 10 {}^{8} } = 2.1 \times 10 {}^{ - 8} KT$