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Question

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:
868212_dacb31dcc4e64b6abb3b755d2b261c6e.png

A
2mA
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B
1mA
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C
3mA
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D
None of these
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