The amplitude of the magnetic field part of a harmonic electro magnetic wave in vaccum is $B_0 =510\;nT$. What is the amplitude of the electric field part of the wave ?

Question

$\begin{array}{1 1} 153\;Nc \\ 153\;Nc^{-1} \\ 15.3\;Nc \\ 15.3\;Nc^{-1} \end{array} $