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 :
Correct Option: 1
Solution:
