The coercivity of a small magnet where the ferromagnet gets demagnetized is
PHYSICS · Single correct · CBSE · Physics · Magnetism and Matter · Magnetism and Matter
Problem
The coercivity of a small magnet where the ferromagnet gets demagnetized is 3×103 Am−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:
(1) 30 mA
(2) 60 mA
(3) 3 A
(4) 6 A