While experimenting, Michael faraday made
a very important discovery in electromagnetism.
Now, known as faraday’s law of electromagnetic
induction.
Faraday’s discovery has given birth to application
like Transformer, Generators, AC motors.
And hence it is very important to every electrical
engineer to understand this law, as it will
make learning of transformers, generators
and AC motor very easy.
So, if you want to get the details and easiest
explanation of faraday’s law of electromagnetic
induction, you need to watch the video.
Michael faraday, revealed a fundamental relationship
between the voltage and flux in the circuit.
So, let’s see what exactly he revealed.
He discovered two important things.
If the flux linking a loop or turn varies
as a function of time, a voltage is induced
between its terminal.
Let’s hear it again.
If the flux linking a loop or turn varies
as a function of time, a voltage is induced
between its terminal.
This means that, let’s say you are having
a copper coil which is surrounded with flux,
and if you vary the flux which are linking
to that coil, a voltage will get induced across
the terminal of that coil.
Now, it really doesn’t matter if you vary
the flux or coil.
But it is also important to know what amount
of voltage will get induced, and on what basis
the value of induced voltage depends?
We don’t have to worry, as faraday has already
told us that, which is the 2nd statement of
faraday’s law of electromagnetic induction.
The value of induced voltage is proportion
to the rate of change of flux.
The faster the flux will vary the more voltage
will generate and vice versa.
We can put this statement in a mathematical
form also.
If flux varies inside of a coil of N turn,
the voltage induced
is given by,
Let’s take an example.
You have a coil with 1000 turns which is surrounded
by flux of 6 mWb produced by a permanent magnet
as shown in fig. now, the magnet is suddenly
moved and the flux inside the coil reduced
to 3 mWb in 1/10 of a second.
What will be the voltage induced?
We can use this formula to find out the total
amount
of voltage induced.
