SELF INDUCTION
If a current is to flow
in a coil or circuit, a magnetic flux relationship occurs in that coil due to
the magnetic field being generated. This value of the magnetic flux is
proportional to the value of the flowing current.
If the current
flowing is changed, the magnetic field produced by it and the corresponding
magnetic flux changes, causing an induced electrical carrying force in the
coil.
Thus the
phenomenon of automatic induced electric force in this circuit due to change in
current flowing in a coil is called self induction.
When current I
flow in a circuit, the value of magnetic flux associated with the circuit is
proportional to Φ current flowing.
∝ ∝ I
Φ = LI
L = best
inductive coefficient or auto regulation.
Unit - Henry
(H)
MUTUAL INDUCTION
When the value of a current flowing in a coil
changes, the induced current carrying force in the adjacent coil is called the
reciprocal induction or Mutual induction due to the change in magnetic flux
corresponding to the adjacent coil.
Mutual inductance
When I1 current
flows in a primary coil or circuit, the value of the total magnetic flux in the
second coil is proportional to the current flowing in the primary coil.
Φ2 ∝ I1
=2 = MI1
Here M is a
constant called reciprocal inductance. Its unit is - Henry (H).
If I2 = 1A
So M
= Φ2.
The numerical
value of M is the relation of the secondary coil to the value of the magnetic
flux that occurs when a current flows in the primary coil.
The reciprocal
induction coefficient depends on the following work-
1. On the
geometry of the coils
2. Through the
core placed inside the coil
3. At the
distance between the coils
4. On the
orientation of both coils
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