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@aarthivg • 15 Apr, 2012

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?

@silverscorpion • 15 Apr, 2012 • 1 like
Ohm's law:

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

Hopkinson's law

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..

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

Hopkinson's law

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..

@aarthivg • 15 Apr, 2012

the options are

lens law

faradays law

rowlands law

maxwells law

Actually this question was asked in an exam.silverscorpionOhm's law:

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

Hopkinson's law

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..

the options are

lens law

faradays law

rowlands law

maxwells law

@silverscorpion • 15 Apr, 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..

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

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