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  • Can someone explain The B-H curve for a ferromagnet is shownin the figure. The ferromagnet is placedinside a long solenoid with 1000 turns/cm.The current that should be passed in thesolenoid to demagnetise the ferromagnetcompletely is :

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 be passed in the
solenoid to demagnetise the ferromagnet
completely is :

  • Option 1)

    1 mA

  • Option 2)

    2 mA

  • Option 3)

    20 μA

  • Option 4)

    40 μA

 

Answers (2)

best_answer

As we learned

 

Hysteresis Curve -

The graph between B and H is called hysteresis curve

- wherein

 

 Coercivity (H)= 100 A/m

H=nI =100 \Rightarrow I=\frac{100}{10n}=\frac{100}{10^{5}} = 1mA

 


Option 1)

1 mA

Option 2)

2 mA

Option 3)

20 μA

Option 4)

40 μA

Posted by

Plabita

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