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A 25cm long solenoid has radius 2cm and ...

A `25cm` long solenoid has radius `2cm` and `500` total number of turns. It carries as current of `15A`.If it is equivalent to a magnet of the same size and magnetization `bar(M)` (magnetic moment//volume) then `|bar(M)|` is:

A

`3piAm^(-1)`

B

`30000Am^(-1)`

C

`300Am^(-1)`

D

`3000Am^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`M` (mag, moment/volume) `=`
`(NiA)/(Al)`
`=(Ni)/l`
`=((500)50)/(2xx10^(-2))`
`=30000Am^(-1)`
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