1.

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)`

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


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