A point source of electromagnetic radiation has an average power output of 1500W. The maximum value of electric field at a distance of 3m from this source in` Vm^-1` is

Options

A. 500
B. 100
C. `500/3`
D. `10 sqrt5`

Answer

B

Explanation

`E_0=sqrt((mu_0cP_(av))/(2 pir^2))=sqrt(((4 pi times 10^-7) times (3 times 10^8) times 1500)/(2 pi times (4)^2))`
`=100 Vm^-1`