A long wire carries a steady current. It is bent into a circle of one – McqOptions

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1.	A long wire carries a steady current. It is bent into a circle of one turn and the 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 [AIEEE 2004]
A.	nB
B.	n2B
C.	2nB
D.	2n2B
Answer» C. 2nB

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