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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic properties of matterEasy2 minPYQ_2020

PhysicsEasysingle choice

The coercivity of a small bar magnet is $4 \times 10^{3} A m^{- 1}$ . It is inserted inside a solenoid of $500$ turns and length $1 m$ to demagnetize it. The amount of current to be passed through the solenoid will be

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Answer:

Solution:

$n$ = number of turns per unit length of solenoid ,

$n = \frac{500}{1}$

$H = n i \Rightarrow i = \frac{H}{n} = \frac{4 \times 10^{3}}{500} = 8 A$

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

⏱ 2mℹ️ Source: PYQ_2020

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