JEE Main 2014 Physics question

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

• (A)60 mA
• (B)3 ACorrect
• (C)6 A
• (D)30 mA