The magnetic field of a beam emerging from a filter facing a floodlight is given by
B0 = 12 × 10–8 sin (1.20 × 107 z – 3.60 × 1015 t) T.
What is the average intensity of the beam?
Given
The equation of magnetic field of the beam
B0 = 12 × 10–8 sin (1.20 × 107 z – 3.60 × 1015 t) T
Comparing the given equation with the general equation of magnetic field i.e.
We have, 
We know that the average intensity of an electromagnetic wave is given as
1