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A current I ampere flows along an infini...

A current I ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is .

A

infinite

B

zero

C

`(mu_(0))/(4pi) . (2I)/r T`

D

`(2I)/r T`

Text Solution

Verified by Experts

The correct Answer is:
B
Let R be the radius of a long thin cylindrical shell.
To calculate the magnetic induction at a distance r (r < R) from the axis of cylinder, a circular shell of radius r is shown.
Since, no current is enclosed in the circle, so from Ampere’s circuital law, magnetic induction is zero at every point of circle. Hence, the magnetic induction at very point inside the infinitely long straight thin walled tube (cylindrical) is zero.
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