PEE-6

What are the difference between magnetic circuit and electric circuit, compare ?
Ans :-
MAGNETIC CIRCUIT                                           ELECTRIC CIRCUIT
1/ The closed path followed by             1/ The closed path for electric current is
 magnetic flux is called magnetic              called an electric circuit.
circuit.
2/Flux,Ø = mmf/reluctance                    2/ Current, I =EMF/RESISTANCE
3/ mmf ( ampere-turns )                         3/ emf ( volts )
4/ Reluctance, S = L/(aμ.μr)                  4/ Resistance, R = þ l/a
5/ Flux density, B = ∅/A Wb/m2            5/ Current density, J = I/a A/m2
6/ mmf drop = ØS                                   6/ Voltage drop = IR
7/Magnetic intensity, H= NI/l AT/M      7/ Electric intensity, E = V/d volt/m
8/ Permeability = 1/reluctivity                8/ Conductivity = 1/resistivity


What is leakage flux ?
Ans :-
        The magnetic flux that does not flow the desired path in a
magnetic is called a leakage flux.
Let
Øi = Total magnetic flux
Øg = Useful magnetic flux across the air gap
So…………
Leakage Flux, ØLeakage = Øi - Øg


What is Leakage coefficient ?
Ans :-
      Leakage coefficient is the ratio of total flux produced ( That
is, flux in the iron ring ) to the useful flux across the air gap.
So, leakage coefficient, λ = (Total flux)/(useful flux) = Øi/Øg
What is electromagnetic induction ?
Ans :-
Whenever magnetic flux linked with the coil changes, an emf is
always induced in it. This induced emf is exit in the coil as long as
the changes in the magnetic flux continues. This phenomenon is known
as electromagnetic induction.