MHT CET 2025 Physics question
A long wire carrying a steady current is bent into a circle of single turn. The magnetic field at the centre of the coil is 'B'. If it is bent into a circular loop of radius '' having 'n' turns, the magnetic field at the centre of the coil for same current is
Answer: (C)
Solution
Let the wire length be . Single turn: and . With turns of radius : . The field at the
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