Question: A typical current in a lightning bolt is 1 3 6 7 0 A . Estimate the magnetic field at a distance of 7 0

A typical current in a lightning bolt is 13670A. Estimate the magnetic field at a distance of 70m from the bolt. Approximate the lightning bolt as acting as a current flowing through a very long wire.
Take the magnetic constant as 0=4x107Tm/A.

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