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JEE Main 2011 Physics question

PhysicsMoving Charges and MagnetismJEE Main 2011

A current I flows in an infinitely long wire with cross section in the form of a semicircular ring of radius R. The magnitude of the magnetic induction along its axis is

Answer: (4)

Solution

Treat the half-cylinder as strips of width carrying , each giving . Only

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Question ID VK-039310