Physics · 2018
JEE Main · 15 April 2018, Shift 1 · Q19
The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with 1000 turns/ cm. The current that should…
The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with $\displaystyle 1000$ turns/ cm. The current that should be passed in the solenoid to demagnetise the ferromagnet completely is :
Official answer
(1)
$\displaystyle 1$ mA
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.