A direct current I flows along the length of an infinitely …

Physics Moving Charge and Magnetism All Topic Question for Revision Test MCQ (Single Correct)

A direct current I flows along the length of an infinitely long straight thin walled pipe, then the magnetic field is

uniform throughout the pipe but not zero

zero only along the axis of the pipe

zero at any point inside the pipe

maximum at the center and minimum at the edge

Text Solution

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The correct answer is:

Required arrangement is shown in the following figure. According to Ampere's circuital law,

For an internal point,

For a point on pipe,

For an external point,

Hence, magnetic field is zero only inside the pipe at any point.

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