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 circle loop of n turns. The magnetic field at the centre of the coil will be?

Question:

Options :

(a) nB
(b) n2B
(c) 2nB
(d) 2n2B

Answer :

(b) n2B

Answer Steps :

step 1:

step 2:

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