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A N turns closely wound circular coil of...

A N turns closely wound circular coil of radius r carries a current I. The magnetic moment of the coil varies as:

A

`1/r`

B

`1/(r^2)`

C

`r^2`

D

`r`

Text Solution

Verified by Experts

The correct Answer is:
c
Magnetic moment, `M = NIA `
`=NIpi r^2`
`therefore M prop r^2`
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