The coercivity of a bar magnet is `120A//m`. It is to be demagnetised by placing it inside a
Channel: Doubtnut
Date: 2020-08-02

The coercivity of a bar magnet is `120A//m`. It is to be demagnetised by placing it inside a solenoid of length `120cm` and number of turns 72. The current (in A) flowing through the solenoid is: