Question

Suppose I produce radio waves with an antenna that have a peak electric field amplitude E and peak magnetic field amplitude B. If I were to double the amplitude of the electric field (i.e. double E) what is the new value for B? B B/4 B/2 Zero 2B 4B

Answer 1

Correct answer is 2B

Step-by-step explanation:

The electric field magnitude and magnetic field magnitude in an electromagnetic waves are related as under

`E=cB`

where 'c' is velocity of light in the medium of transmission

According to the given question if we double the electric field we have

`2E=cB'\\\\2cB=cB'\\\\B'=2B`

Thus the magnetic field also doubles