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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

A long wire carrying a steady current is bent into a single coil such that magnetic induction at centre is . then same wire is bent to form a coil of smaller radius of turns when magnetic induction at centre is . Then

Answer: (C)

Solution

For length : one turn with ; turns have radius so

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Question ID VK-078725