Amplitude of magnetic field of an electromagnetic wave in a vacuumis given to us as,

$B_{0}=510 n T=510 \times 10^{-9} T$

Speed of light in vacuum is known as $\mathrm{c}=3 \times 10^{8} \mathrm{~m} / \mathrm{s}$

The relation for the amplitude of electric field of an electromagnetic wave is,

$E=c B_{0}=3 \times 10^{8} \times 510 \times 10^{-9}=153 \mathrm{~N} / C$

As a result, $153 \mathrm{~N} / \mathrm{C}$ is the electric field part of the wave.