A long wire carrying a steady current is bent into circular loop of one turn The magnetic field at the centr of the loop is B It

Question

A long wire carrying a steady current is bent into circular loop of one turn The magnetic field at the centr of the loop is B It is then bent into a circular coil of turns The magnetic field at the centre of this coil of turns will be 1 nB 2 n B 3 2nB 4 2n B

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