Hello, i'm Banuchichak and for the next three minutes
we'll discuss electomagnetic induction.
The mechanism that most of the devices and technological innovations are based on
is electromagnetic induction. The most well known
applications are inductors, transformers, wireless charging.
Let's have a look how it works.
For the experiment we need a galvanometer, a coil
and a magnet.
A galvanometer is an instrument used to detect, measure
and determine the direction of small electric currents.
Let's move the magnet closer to the coil.
As you an see the galvanometer shows the presence of induction currents.
When the magnet is put closer to the coil the magnetic field in the space surrounded
by it changes. A current is generated.
This phenomenon is called electromagnetic induction.
When we take it away, also the magnetic field changes.
The pointer of the galvanometer moves to the other side.
So everytime the magnetic field changes in the coil
electrical current is generated.
The reason is the arising
of electrical field in the space around the changing magnetic field.
So let's determine the direction of the induction current.
We are using Lenz's loops for this.
So when we move the magnetic bar near the loop that is not enclosed
nothing is observed.
Because an electrical current doesn't form.
But in case of enclosed loop, the loop repulses
because of the induction of the magnetic field generated.
by the induction current is direction against the induction
of the magnetic field that generates it.
But when we remove the magnet the loop is attracted.
Because the inductions are directed to the same direction on the magnetic flux decrease.
For determining the direction of the induction current all we need is four steps.
First
Determine the direction of B1.
B1 is the induction of the magnetic field of this magnet.
Second
Know magnetic flux is increased or decreased.
Third
Know B2's directions.
And fourth, right hand rule.
If the thumb is in the direction of B2, other fingers show the induction current direction.
And that's it.
I hope you will enjoy this video.
Goodbye!
