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A circular coil of wire "n" turns has a ...

A circular coil of wire `"n"` turns has a radius `"r"` and carries a current `"I"`. Its magnetic dipole moment is `"M"`.Now the coil is unwound and again rewound into a circular coil of half the initial radius and the same current is passed throught is, then the dipole moment of this new coil is

A

`M//2`

B

`M//4`

C

`M`

D

`2M`

Text Solution

Verified by Experts

The correct Answer is:
1
`M=niA`
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