Question

If the electric field emitted by a radio tower has an amplitude of 150 V/m, what is the amplitude of the corresponding magnetic field?

Answer 1

Write the relationship between electric field E and magnetic field B of an electromagnetic wave.

E_max / B_max = c ...... (1)

Here, c is speed of light.

speed of light (c) = 3 x 10⁸ m/s

E_max = 150 V/m

Sustitute   3 x 10⁸ m/s for c, 150 V/m for E_max in equation (1).   

B_max = E_max / c

= (150 V/m) / (3 x 10⁸ m/s)

= 5 x 10^-7 V.s/m²

B_max = 5 x 10^-7 T

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