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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



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


Grade:upto college level

1 Answers

Kevin Nash
askIITians Faculty 332 Points
7 years ago

(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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