Question

If the electric field in an em wave has a peak magnitude of 0.39 ✕ 10-4 v/m, what is the peak magnitude of the magnetic field strength?

Answer 1

In an electromagnetic wave, the electric field peak magnitude E and the magnetic field peak magnitude B are related by

`E=cB`
where
`c=3 \cdot 10^8 m/s` is the speed of light. Substituting
`E=0.39 \cdot 10^(-4) v/m`, we can find the peak magnitude of the magnetic field:

`B= (E)/(c)= (0.39 \cdot 10^(-4) v/m)/(3 \cdot 10^8 m/s) =1.3 \cdot 10^(-13)T`