Question

If a long hollow copper pipe carries a current in its wall, then what will be the produced magnetic field at tge center of the pipe ?​

Answer 1

Inside a hollow pipe carrying current, the magnetic field is zero, [since according to Ampere''s law, Bi. 2pr = m0 × 0 Þ Bi = 0.

But for external points, the current behaves as if it was concentrated at the axis only; so, outside,

B0 = i. Thus, the magnetic field is produced outside the pipe only.

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