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If a long hollow copper pipe carries a current, then magnetic field is produced
(a) Inside the pipe only
(b) Outside the pipe only
(c) Both inside and outside the pipe
(b) No where
(b)
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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