Faraday’s Law of electromagnetic induction
The phenomenon by which an emf is induced in a conductor when it is cut by magnetic flux is known as electromagnetic induction.
Faraday’s First Law
It states that,When ever a conductor cuts a magnetic field or viceversa an emf is induced in it and it setsup in such a direction so as to oppose the cause of it.
Faraday’s second law
It states that the magnitude of induced emf is equal to the rate of change of flux linkage.
e = -NdØ/dt
e – induced emf
N- number of turns of coil
dØ/dt – rate of change of flux
the minus sign represents that the induced emf or current sets up in a direction so as to oppose the cause of it.
Induced emf could be classified into dynamically induced emf and statically induced emf.
Dynamically induced emf
This is the emf induced due to the motion of a conductor in a magnetic field.
e = Blv volts
B – flux density of magnetic field in Tesla
l = length of conductor in meters
v- velocity of conductor in m/s
if the conductor moves in an angle θ,the induced emf could be represented as
the direction of induced emf is given by f lemmings right hand rule.
Statically induced emf
The emf produced in a conductor due to the change in magnetic field is called statically induce emf .It could be classified into two
1)self induced emf and 2)mutual induced emf