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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

A current ampere flows along an infinitely long straight thin walled tube. The magnetic induction at any point inside the tube at a distance metre from axis is

Answer: (A)

Solution

By Ampere's law, a circular loop inside the tube encloses no current, so there;

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Question ID VK-078826