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An iron rod of volume 10^(-4)m^(3) and r...

An iron rod of volume `10^(-4)m^(3)` and relative permeability 1000 is placed inside a long solenoid wound with 5 `turns"/"cm`. If a current of `0.5 A` is passed through the solenoid, then the magnetic moment of the rod is

A

`10 Am^(2)`

B

`15 Am^(2)`

C

`20Am^(2)`

D

`25 Am^(2)`

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