Answer
$B=6.7nT$
Work Step by Step
We know that;
$B=\frac{E}{c}$
where B is the amplitude of the magnetic field, V is the magnetic field strength and C is the speed of light.
We plug in the known values to obtain:
$B=\frac{2}{3\times 10^8}=6.7\times 10^{-9}=6.7nT$
