# 7. The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is . What is the amplitude of the electric field part of the wave?

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

Speed of light(c) = 3  108 ms-1

Electric Field = B  c

= 510  10-9 T    3  108 ms-1

= 153 NC-1

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