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

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

AIEEEAIEEE 2004Moving Charges and Magnetism

Solution:

Considering Ampere’s loop (shown by dotted line), no current is enclosed by this loop. Therefore, the magnetic field will be zero inside the tube.