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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
  1. 2mA
  2. 1mA
  3. 3mA
  4. None of these

A
None of these
B
2mA
C
1mA
D
3mA
Solution
Verified by Toppr

N=1000turns/cm

H=NIl

100AM=1000×I102

100A=105×I

103A=I

I=1mA

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868212_dacb31dcc4e64b6abb3b755d2b261c6e.png
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