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 (d) no where

Answer: (b). Inside the hollow pipe an Amperian loop encloses no current, so B = 0. Outside, the loop encloses the full current: B = (μ₀ I)/(2π r). So the answer is (b) outside the pipe only.

If a long hollow copper pipe carries a current, then magnetic field… | NEET 1999 (AIPMT)

Q61NEET 1999 · AIPMTEasy

Ampere's Law, Cylinders, Solenoid & Toroid

If a long hollow copper pipe carries a current, then magnetic field is produced

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Answer: (b)

Inside the hollow pipe an Amperian loop encloses no current, so $B = 0$ .
Outside, the loop encloses the full current: $B = \frac{\mu_0 I}{2\pi r}$ .
So the answer is (b) outside the pipe only.

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