the magnetic equivalent of ohm's law is ..

aarthivg

aarthivg

@aarthivg-HH344f • Oct 27, 2024
Today, one of our lecturers asked this question in classroom. It was - What is the magnetic equivalent of ohm's law? I am clueless about the answer to this. Can some CEan explain?
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  • silverscorpion

    silverscorpion

    @silverscorpion-iJKtdQ • Apr 15, 2012

    Ohm's law:

    E = IR where E is the EMF, I is the current and R the resistance.

    <a href="https://en.wikipedia.org/wiki/Magnetic_circuit#Hopkinson.27s_law:_the_magnetic_analogy_to_Ohm.27s_law" target="_blank" rel="nofollow noopener noreferrer">Magnetic Circuit Hopkinson.27S Law: The Magnetic Analogy To Ohm.27S Law</a>

    F = ΦR[sub]m[/sub] where F is the MMF, Φ is the magnetic flux and R[sub]m[/sub] the magnetic reluctance

    Just as Ohm's law relates the EMF across an element in a circuit to the current flowing through that element, Hopkinson's law relates the MMF (MagnetoMotive Force) across a magnetic element in a circuit to the magnetic flux through that element. The constant corresponding to electrical resistance in Ohm's law, is magnetic reluctance in Hopkinson's law..
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  • aarthivg

    aarthivg

    @aarthivg-HH344f • Apr 15, 2012

    silverscorpion
    Ohm's law:

    E = IR where E is the EMF, I is the current and R the resistance.

    <a href="https://en.wikipedia.org/wiki/Magnetic_circuit#Hopkinson.27s_law:_the_magnetic_analogy_to_Ohm.27s_law" target="_blank" rel="nofollow noopener noreferrer">Magnetic Circuit Hopkinson.27S Law: The Magnetic Analogy To Ohm.27S Law</a>

    F = ΦR[sub]m[/sub] where F is the MMF, Φ is the magnetic flux and R[sub]m[/sub] the magnetic reluctance

    Just as Ohm's law relates the EMF across an element in a circuit to the current flowing through that element, Hopkinson's law relates the MMF (MagnetoMotive Force) across a magnetic element in a circuit to the magnetic flux through that element. The constant corresponding to electrical resistance in Ohm's law, is magnetic reluctance in Hopkinson's law..
    Actually this question was asked in an exam.
    the options are
    lens law
    faradays law
    rowlands law
    maxwells law
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  • silverscorpion

    silverscorpion

    @silverscorpion-iJKtdQ • Apr 15, 2012

    ^^ Then the answer would be Rowland's law.. It seems Hopkinson's law is also called Rowland's law.

    In that same Wiki page, there is an analogy of various elements in magnetic and electric circuits. Refer that..
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