Q. The voltage of clouds is $4 \times 10^{6}\ volt$ with respect to ground. In a lightening strike lasting $100\ m\ sec,$ a charge of 4 coulombs is delivered to the ground. The power of lightening strike is
A) $160\ MW$
B) $80\ MW$
C) $20\ MW$
D) $500\ KW$
Explanation
(b) Work done $= \frac{1}{2}q\ V = \frac{1}{2} \times 4 \times 4 \times 10^{- 6}$
Power $= \frac{8 \times 10^{6}}{0.1} = 80\ MW$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.