The coercivity of a small magnet where the ferromagnet gets demagnetized is

Question:

The coercivity of a small magnet where the ferromagnet gets demagnetized is $3 \times 10^{3} \mathrm{~A} \mathrm{~m}{ }^{-1}$. The current required to be passed in a solenoid of length $10 \mathrm{~cm}$ and number of turns 100 , so that the magnet gets demagnetized when inside the solenoid, is :

  1. 3 A

  2. 6 A

  3. 30 mA

  4. 60 mA


Correct Option: 1

Solution:

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