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A closely wound solenoid of 750 turns an...

A closely wound solenoid of 750 turns and area of cross section of `5xx 10^(4)m^(2)` carries a current of 3.0 A. Its associated magnetic moment is

A

`4.12JT^(-1)`

B

`3.12JT^(-1)`

C

`2.12JT^(-1)`

D

`1.13JT^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
Here, n=750 turns, `A=5xx10^(-4)m^(2), I=3A`
Then, magnetic moment
`m=nIA=750xx3xx5xx10^(-4)=11250xx10^(-4)`
`=1.125JT^(1)=1.13JT^(1)"along the axis of solenoid"`
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