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The voltage of clouds is 4×10⁶V respect to ground. In a lightning strike lasting 100ms, a charge of 4C is delivered to the ground. The average power of lightning strike is (assume complete discharge).

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160MW

80MW

20MW

500KW

answer is A.

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Detailed Solution

Work done in delivering q coulomb of charge from clouds to ground.

$W = Vq = 4 \times 10^{6} \times 4 = 16 \times 10^{6} J$

The power of lightning strike is

$P = \frac{W}{t} = \frac{16 \times 10^{6}}{0 .1} = 160 \times 10^{6} W = 160 MW$

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