An iron rod of volume `10^(-4)m^(3)` and relative permeability 1000 is placed inside a long solenoid
Channel: Doubtnut
Date: 2020-01-19

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