Home Physics Moving Charge and Magnetism All Topic Question for Revision Test If a long hollow copper pipe carries a direc…
Physics Moving Charge and Magnetism All Topic Question for Revision Test MCQ (Single Correct)

If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be

A
only inside the pipe
B
only outside the pipe
C
both inside and outside the pipe
D
neither inside nor outside the pipe

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Verified by Experts
The correct answer is:
B

As we know, according to Ampere's law

Only for outside point, path of line integration will enclose the current. Hence, magnetic field inside the pipe is zero.

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