Electromagnetic Induction. emf is induced in a conductor placed in a magnetic field whenever there is a change in magnetic field. Moving Conductor in a Magnetic Field. Consider a straight conductor moving with a uniform velocity, v , in a stationary magnetic field.
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E = Blv.
E = E It = W
E= Blv
Unit : weber (Wb)
The ‘’ sign indicates that the induced e.m.f. acts to
oppose the change.
http://physicsstudio.indstate.edu/java/physlets/java/indcur/index.html
http://micro.magnet.fsu.edu/electromag/java/lenzlaw/index.html
http://www.walterfendt.de/ph11e/generator_e.htm
Armature coils, R
Back emf, Eb
Driving source, V
MultiplyingbyI, then
I
t
0
Larger load
Zero load
I
0
Po
0
The magnetic flux linkage in a coil the current flowing through the coil.
Where L is the constant of proportionality for the coil.
L is numerically equal to the flux linkage of a circuit when unit current flows through it.
Unit : Wb A1 or H (henry)
Lis numerically equal to the emf induced in the circuit
when the current changes at the rate of 1 A in each second.
or

+
The energy originally stored
in the magnetic field of the coil
is now stored in the electric
field of the capacitor.

+