The coercivity for a certain permanent magnet is 4 0 x 104 A

Last updated: 6/19/2023

The coercivity for a certain permanent magnet is 4 0 x 104 A m 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 10 A 20 A 30 A