Question: A typical lightning bolt carries a peak current of 100 kA. (a) Estimate the peak magnetic field a distance of 500 m from where the

A typical lightning bolt carries a peak current of 100 kA.
(a) Estimate the peak magnetic field a distance of 500 m from where the lightning bolt strikes the ground.
(b) If you have a device that can measure magnetic fields as small as B = 100 pT (10^-10 T), how far can you be from the lightning bolt and still detect its magnetic field?

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