If a long hollow copper pipe carries a current, then magnet…

Physics Moving Charge and Magnetism Magnetic Field Due to a Cylinder, Large Sheet, Solenoid, Toroid and Ampere's Law MCQ (Single Correct)

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

inside the pipe only

outside the pipe only

both inside and outside the pipe

no where

Text Solution

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The correct answer is:

According to Ampere's circuital law

B(2πr) = × 0

or B = 0

So, inside a hollow metallic (copper) pipe carrying current, the magnetic field is zero.

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

Thus, the magnetic field is produced outside the pipe only

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