The voltage of clouds is `4 xx 10^(6) V` with respect to ground. In a lighting strike lasting `100 ms`, a charge of `4 C` is delivered to the ground. The power of lighting strike is

Options

A. `20 MW`
B. `80 MW`
C. `160 MW`
D. `500 kW`

Answer

C

Explanation

(c ) Work done in delivering `q` coulomb of charge from clouds to ground.
`W = V_(q) = 4 xx 10^(6) xx 4 = 16 xx 10^(6) J`
The power of lighting strike is
`P = (W)/(t) = (16 xx 10^(6))/(0.1) = 160 xx 10^(6) W = 160 MW`