A lightning bolt strikes one end of a steel lightning rod, producing a 14700 A c

Question

A lightning bolt strikes one end of a steel lightning rod, producing a 14700 A current blast that lasts for 63 micro sec. The rod is 2.5 m long and 1.7 cm in diameter, and its other end is connected to the ground by 34 m of 8 mm diameter copper wire.

A) Find the potential difference between the top of the steel rod and the lower end of the copper wire during the current burst.
(Express using 2 significant figures)

B) Find the total energy deposited in the rod and wire by the current burst.
(Express using 2 significant figures)

Thank You!! WILL RATE!!!!

Explanation / Answer

for steel rod R = l/A = 2*10^-8*2.5/3.14*0.017^2

=0. 55 mOhms

V steel = iR = 14700*0.55*10^-3 = 8.085 volts



for copper R = 1.72*10^-8*34/3.14*16*10^-6 = 0.0116 OHMS

V for copper Vc = iR = 14700*0.0116 = 170.52 volts



PD = 170.52 - 8.085 = 162.435 Volts



B. power = energy/time = Vi

energy = vit = 162.435*14700*63*10^-6 = 57.82 watts

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