The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 x 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 placed inside the solenoid is
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a
3 A
b
30 mA
c
60 mA
d
3 MA
answer is A.
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Detailed Solution
H is the demagnetizing field that comes from a solenoid For solenoid B=μ0Nil then H=Nilgiven H= 3×103 A/m = Nil, i =0.1×3×103100=3 A
The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 x 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 placed inside the solenoid is