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  4. The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with 1000 turns cm- 1 . The current that should be passed in the solenoid to demagnetise the ferromagnet completely is <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-5the4tjxiyly.png />

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Q. The $B-H$ curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with $1000 \, turns \, cm^{- 1}$ . The current that should be passed in the solenoid to demagnetise the ferromagnet completely is

Question

NTA AbhyasNTA Abhyas 2020Moving Charges and Magnetism

Solution:

Coercivity of ferromagnet, $H=100A/m$ .
$n\times I=100$
$I=\frac{100}{10^{5}}=1 \, mA$