The coercivity of a small magnet where the fe | vedclass

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(B) The coercivity $H_c$ is the magnetic field intensity required to demagnetize a material.For a solenoid,the magnetic field intensity $H$ is given b

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$3 \ A$

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(B) The coercivity $H_c$ is the magnetic field intensity required to demagnetize a material.For a solenoid,the magnetic field intensity $H$ is given by $H = n i$,where $n$ is the number of turns per unit length and $i$ is the current.Given:Coercivity $H_c = 3 	imes 10^3 \ Am^{-1}$Length of solenoid $L = 10 \ cm = 0.1 \ m$Number of turns $N = 100$Number of turns per unit length $n = N / L = 100 / 0.1 = 1000 \ m^{-1}$To demagnetize the magnet,the solenoid must produce a magnetic field intensity equal to the coercivity:$H = H_c$$n i = 3 	imes 10^3$$1000 	imes i = 3 	imes 10^3$$i = 3 \ A$

The coercivity of a small magnet where the ferromagnet gets demagnetized is $3 \times 10^3 \ Am^{-1}$. The current required to be passed in a solenoid of length $10 \ cm$ and number of turns $100$,so that the magnet gets demagnetized when inside the solenoid,is:

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