An iron bar magnet having a coercivity of 4000 A/m

An iron bar magnet having a coercivity of 4000 A/m

An iron bar magnet having a coercivity of 4000 A/m is to be demagnetized. If the bar is inserted within a cylindrical wire coil 0.15 m long and having 100 turns, what electric current is required to generate the necessary magnetic field?

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