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A 100 turn closely wound circular coil o...

A 100 turn closely wound circular coil of radius `10cm` carries a current of `3*2A`. (i) What is the field at the centre of the coil? (ii) What is the magnetic moment of this arrangement?

A

`10 Am^2`

B

`20 Am^2`

C

`50 Am^2`

D

`100 Am^2`

Text Solution

Verified by Experts

The correct Answer is:
a
Here, `N = 100, I =3.2 A and r = 10 cm=0.1 m `
Magnetic moment associated with the coil,
`m = NIA= 100 xx 3.2 xx 3.14 xx (0.1)^2`
`= 10 Am^2`
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