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The magnetic moment of a circular coil ...

The magnetic moment of a circular coil carrying current is

A

`L^(0)`

B

`L^(1)`

C

`L^(2)`

D

`L^(3)`

Text Solution

Verified by Experts

The correct Answer is:
C
For the circular coil, `2pi r=L" ":. r=L/(2pi)`
and the magnetic moment
`M=IA` but `A=pir^(2)`
`=I.pi r^(2) =I.pi .(L^(2)/(4pi^(2)))`
`:. M=(L^(2)I)/(4pi)" ":. M prop L^(2)`
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