A long wire carries a steady current. It bent into a circle of one turn and magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be :

A long wire carries a steady current. It bent into a circle of one tur

1.	A long wire carries a steady current. It bent into a circle of one turn and magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be :
Answer» NB `2n^(2)B` 2nB `n^(2)B` ANSWER :A

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A long wire carries a steady current. It bent into a circle of one turn and magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be :

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