Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic Dipole & MomentEasy2 minPYQ_2020

PhysicsEasysingle choice

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

Options:

Answer:

Solution:

Coercivity of ferromagnet, $H = 100 A / m$ .

$n \times I = 100$

$I = \frac{100}{10^{5}} = 1 m A$

Stream:JEESubject:PhysicsTopic:MagnetismSubtopic:Magnetic Dipole & Moment

⏱ 2mℹ️ Source: PYQ_2020

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