# 7. The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is $B_0 = 510 n T$. What is the amplitude of the electric field part of the wave?

S Sayak

Magnetic Field (B0)=510 nT = 510 $\times$ 10-9 T

Speed of light(c) = 3 $\times$ 108 ms-1

Electric Field = B $\times$ c

= 510 $\times$ 10-9 T   $\times$ 3 $\times$ 108 ms-1

= 153 NC-1

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