Question

Draw propagation diagram of a linearly polarised electromagnetic wave and write any two properties of electromagnetic waves.
The amplitude of the magnetic field associated with an electromagnetic wave in vacuum is $B_0=50\times {10}^{-8}$ tesla. Write the value of amplitude of the electric field in $V/m$ associated with the wave.

Answer 1

Two properties of electromagnetic waves are-

1. Electromagnetic waves are propagated by oscillating electric and magnetic fields oscillating at right angles to each other.

2. Electromagnetic waves need no medium of propagation.

The amplitude of electric field and magnetic field are related as

$E_0=c{B}_0$

$⟹E_0=3\times {10}^8\times 50\times {10}^{-8}V/m$

$=150V/m$