Laws of Electromagnetic Induction
Faradays’ Laws of
Electromagnetic Induction:
Faraday’s First Law
Faraday’s First Law states that whenever the magnetic flux is linked with a circuit changes, an emf is always induced in it.
Faraday’s Second Law
Faraday’s Second Law states that the magnitude of the induced emf is equal to the rate of change of flux linkage.
Dynamically Induced EMF:
Dynamically induced emf means
an emf induced in a
conductor when the conductor moves across a magnetic field. Ex.
generators.
Statically Induced EMF :
The emf induced in a coil due to change of flux linked with it is
called statically induced emf.
Ex: Transformer. There are two types of statically induced emf as stated
below:-
- Self induced emf (Produced with in the same coil)
- Mutually induced (EMF produced in the neighboring coil)
Self-induction:
When this emf is induced in the same circuit in which the current is changing this effect is called Self-induction.
Mutual Inductance:
The process in which a changing current in one coil induces
emf in another coil, is called mutual induction
In
the Fig current flowing in coil L1 sets up a magnetic field around it self with
some of its magnetic field line passing through coil L2 giving in mutual
inductance coil one L on has a current of I, and N, turns while coil two L2,
has N2 turns therefore mutual inductance M, of coil two that exists with
respect to coil one L, depend on their position with inspect to each other.
Lenz’s Law:
The direction of the self-induced emf is explained by Lenz’s Law. Lenz’s Law States that A change in current produces an emf whose direction is such that it opposes the change in current. In other words, when a current is decreasing, the induced emf is in the same direction as the current and tries to oppose the current from decreasing. And when a current is increasing, the polarity of the induced emf is opposite to the direction of the current and tries to prevent the current from increasing.
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