Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic properties of matterEasy2 minPYQ_2014

PhysicsEasysingle choice

The coercivity of a small magnet, where the ferromagnet gets demagnetised is $3 \times 10^{3} A / m$ . The current required to be passed in a solenoid of length $10 cm$ and number of turns $100$ , so that the magnet gets demagnetised when inside the solenoid is

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Answer:

Solution:

For solenoid, the magnetic field needed to be magnetised the magnet.

$B = μ_{0} n I$

where, $n = 100, l = 10 cm = \frac{10}{100} m = 0.1 m$

$\Rightarrow 3 \times 10^{3} = \frac{100}{0.1} \times I$

$\Rightarrow I = 3 A$

Stream:JEESubject:PhysicsTopic:MagnetismSubtopic:Magnetic properties of matter

⏱ 2mℹ️ Source: PYQ_2014

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