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# 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 ?

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

given $B_0 = 510 nT$
$\qquad= 510 \times 10^{-9}$
$E_0= c B_0= 3 \times 10^8 \times 510 \times 10^{-9}$
$\qquad= 153 \;NC^{-1}$