Question

The oscillating magnetic field in a plane electromagnetic wave is given by

B_y = 8 x 10⁶ sin (2 x 10¹¹ t + 300 πx) 

(i) Calculate the wavelength of electro-magnetic wave.

(ii) Write down the expression for the oscillating electric field.

Answer 1

Given B = 8 x 10⁶ sin (2 x 10¹¹ t + 300 πx) T

(i) On comparing the equation using sinusoidal wave form equation of magnetic field

(ii) Electric field is given as

E_z = B_z c = 24 x 10¹⁴ sin [2 x 10¹¹ t + 300 πx] Vm^-1