a bolt of lightening, such as the one shown on the left in the figure, behaves l

Question

a bolt of lightening, such as the one shown on the left in the figure, behaves like a vertical wire conducting electric current...

A bolt of lightning, such as the one shown on the left in the figure, behaves like a vertical wire conducting electric current. As a result, it produces a magnetic field whose strength varies with the distance from the lightning. A 18-turn circular coil with a radius of .883 m is oriented perpendicular to the magnetic field as shown. The magnetic field at the coil drops from 5. Times 1-3 T to . T in 1.9 mu s. What is the average emf induced in the coil? Answer in units of V

Explanation / Answer

Area

A=pi*r^2 =pi*0.883^2

A=2.45 m^2

induced emf

E=NA(dB/dt)

E=180*2.45*(5*10^-3/10.9*10^-6)

E=2.02*10^5 V

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