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# The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a ling solenoid with 1000 turns/cm.. The current that should be passed in the solenoid to demagnetise the ferromagnet completely is:2mA1mA3mANone of these

A
None of these
B
2mA
C
1mA
D
3mA
Solution
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#### N=1000turns/cmH=NIl100AM=1000×I10−2100A=105×I10−3A=II=1mA

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