Question

The magnetic field in an electromagnetic wave has a peak value given by b = 4.8 μt . part a part complete for this wave, find the peak electric field strength. express your answer using two significant figures. e = 1.4 kv/m submitprevious answers correct part b find the peak intensity. express your answer using two significant figures.

Answer 1

The relationship between intensity of the magnetic field B and intensity of the electric field E for an electromagnetic wave is given by
$E=cB$
where $c=3 \cdot 10^8 m/s$ is the speed of light.

This relationship holds also for the peak intensity of the two fields. Since the peak intensity of the magnetic field is
$B=4.8 \mu T= 4.8 \cdot 10^{-6}T$
we can use the previous relationship to find the peak value of the electric field:
$E=(3 \cdot 10^8 m/s)(4.8 \cdot 10^{-6} T)=1440 V/m=1.4 kV/m$