The coercive force for a certain prmanent magnet is `4.0 xx 10^4 A m^(-1)`. This magnet is placed
Channel: Doubtnut
Date: 12/07/2020

The coercive force for a certain prmanent magnet is `4.0 xx 10^4 A m^(-1)`. This magnet is placed inside a long solenoid of 40 turns/cm and a current is passed in the solenoid to demagnetize it completely. Find the current.