The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 103 A m–1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is :

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The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 103 A m^–1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is :

60 mA

3 A

6 A

30 mA

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Hysteresis loops for two magnetic materials A and B are given below:

These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use:

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