### Popular Articles

At one time Russia rivaled the USA as a global power, but then came Gorbochov and we all know that Russia broke up into 18 states. This was also the end
From the 8th century the Muslim invaders began to make forays into Hindustan and by the 12th century the entire North India and the throne at Delhi had
Privacy is an important thing in every section. Same goes for mobile phones too. People always have something to hide from others on their mobile phone

### Latest Articles

Subhas Chandra Bose was a rival of Gandhi and during the war he threw his lot with the Fascist powers and joined them. He had a one point agenda to overthrow
At one time Russia rivaled the USA as a global power, but then came Gorbochov and we all know that Russia broke up into 18 states. This was also the end
I had in an earlier post pointed out that the great Hindu warrior  Hemu was struck by an arrow in his eye in the third battle of Panipat and lost

Comparison between electrical circuit and magnetic circuit

From Amperes law we know that mmf (magneto motive force) around a closed path is equal to the current enclosed by the closed path.

That is integration of   H.dl = Ni    ………(1)

Where H = magnetic field intensity,

dl = small incremental length,

N = number of conductors and

i = current flowing in each conductors.

Now if H is constant then from equation (1)

Integration of H.dl = Ni

→  (H) integration of dl = Ni

→                          H . l  = Ni

therefore     H  = Ni/l       ………(2)

Now because flux ф = B.A = μH.A     (because B = μH)    …………(3)

Where B = magnetic flux density, H = magnetic field intensity, μ = permeability of medium and A = area.

Now from equation (2) and equation (3)

Ф = μNil /A

→ Ф = Ni / ( l / μA)   ………………(4)

Similarities between magnetic circuit and electric circuit

• Magnetic circuit follows equation (4) that is Ni = (Ф) ( l / μA)   or m.m.f(magneto motive force) = (Flux) (reluctance).

Electric circuit follows ohm’s law that is E = I.R or e.m.f(electro motive force) = (current) (Resistance)

• From above point m.m.f in magnetic circuit is like as e.m.f in electrical circuit.
• Flux in magnetic circuit is similar as current in electrical circuit.
• Reluctance in magnetic circuit, S = ( l / μA) is similar to resistance R = (ρl/A) in electric circuit.
• Permeance (= 1/reluctance) in magnetic circuit is equivalent to conductance (=1/resistance) in electric circuit.

Differences between magnetic circuit and electric circuit

• In magnetic circuit flux establishes but not flow like as current in magnetic circuit.
• In magnetic circuit energy needed only to establish the flux but no consistent energy need to maintain it whereas in electric circuit continuous energy needed to flow of current.
• Resistance of an electric circuit is constant (for same temperature) and is independent of current but reluctance of magnetic circuit is not constant because it depends on μ (=B/H) which is not constant and depends on B/H.