Question

The oscillating electric field of an electromagnetic wave is given by:

Ey =30sin [2 x 1011t + 300πx]Vm-1

(a) Obtain the value of the wavelength of the electromagnetic wave.

(b) Write down the expression for the oscillating magnetic field

Answer 1

(a) Given equation is

Ey =30sin [2 x 1011t + 300πx]Vm-1

Comparing with standard equation

Ey = E0sin(ωt + kx)Vm-1, we get

(b) The wave is propagating along X-axis, electric field is oscillating along Y-axis, so according to right hand system of (vector E, vector B, vector K), the magnetic field must oscillate along Z-axis.