Question

9
The coercivity of a small magnet where the
ferromagnet gets demagnetized, is 103 A/m. The
current required to be passed in a solenoid of
length 10 cm of turn 200, so that the magnet gets
demagnetized when inside the solenoid, is
[NCERT Pg. 176]
)
(1) 0.5 A
(2) 2A
(3) 3 A
(4) 4 A​

Answer 1

Explanation:

options 3Therefore the current required to be passed in a solenoid of length 10cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid is 3A. Hence, the correct answer is option (C).