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Q.

A uniform copper wire of length “L” is bent into a circular coil of two turns and a current “i” is passed through it. The coil now behaves like a magnetic dipole of moment

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a

i L2 /4 π

b

i L2 /2 π

c

i L2 /16 π

d

i L2 /8 π

answer is B.

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Detailed Solution

L = 2 × 2πr
r=L4πM=niA=2xixπL4π2=iL28π 

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A uniform copper wire of length “L” is bent into a circular coil of two turns and a current “i” is passed through it. The coil now behaves like a magnetic dipole of moment