The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 10 3 Am –1 . The current required to be passed in a solenoid of length 20 cm and number of turns 100, so that the magnetic gets demagnetized when inside the solenoid, is:
Text Solution
Verified by ExpertsThe correct answer is:
D
For solenoid
B = µ 0 nI
H = nI
⇒ 3 × 10 3 = 
× I
I = 6A
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