Question

True or False? The average magnitude of the Poynting Vector is also known as intensity.

1. False
2. True

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?

1. 4B
2. B/4
3. B
4. 2B
5. Zero
6. B/2

Answer 1

True, intensity is the average magnitude of poynting vector.

Since, B = E/C,

Means amplitude of magnetic field is directly proportional with amplitude of electric field.

Hence ,2B. Ans