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Lightning bolts can carry currents up to approximately 20 ka. we can model such a current as the equivalent of a very long, straight wire. part a if you were unfortunate enough to be 5.0 m away from such a lightning bolt, how large a magnetic field would you experience

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W0lf93
B (Magnetic) = (u x I)/ (2(pi) x r) pi = 3.141592654 u (permeability of free space) = 4pi x 10 ^(-7) (Tesla*meters/Amp) r = 5 meters I = 20000 kA B = (u x I)/ (2(pi) x r) = (4pi x 10 ^(-7) x 20000)/(10pi) = 8 x 10^-4 Tesla = 800 microTeslas

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