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A circular coil of 300 turns and diamete...

A circular coil of `300` turns and diameter `14cm` carries a current of `15A`. What is the magnitude of magnetic moment linked with the loop?

A

`51.7JT^(-1)`

B

`69.2JT^(-1)`

C

`38.6JT^(-1)`

D

`19.5JT^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
Here=n=300, I=15A, r=7cm, `7xx10^(-2)m`
`therefore M=NIA=NIxxpir^(2)`
`=300xx15xx3.14xx(7xx10^(-2))^(2)=69.2JT^(-1)`
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