Q111 / 180 · AIIMS 2006 · Physics
The voltage of clouds is $4 \times 10^6$ volt with respect to ground. In a lightening strike lasting $100 \mathrm{msec}$, a charge of 4 coulombs is delivered to the ground.
The power of the lightening strike is
- Correct answerA$160 \mathrm{MW}$
- B$80 \mathrm{MW}$
- C$20 \mathrm{MW}$
- D$500 \mathrm{MW}$.
Solution
Work done $=$ charge $\times$ potential difference $W=4 \times\left(4 \times 10^6-0\right)=16 \times 10^6 \mathrm{~J}$.
Power of the lightening strike, $P=\frac{W}{t}$
$$
=\frac{16 \times 10^6}{100 \times 10^{-3}}=160 \mathrm{MW} .
$$
Hence, the correct answer is option: 'A'.