Electromagnetic induction is the production 
of voltage across an electrical conductor
in a changing magnetic field.
The voltage induced will result in a current 
in the coil and it can be deduced by the change
in the direction of a galvanometer.
It can happen, either way, the magnet can 
be moved towards the coil so that current
is induced in it or current carrying coil 
itself can we moved towards a magnetic field
so that current is induced in it.
Either way, there should be a change in the 
magnetic field in the coil and hence current
will be induced in it.
The direction of the Galvanometer’s needle 
deflection, depends on the direction of the
current.
Also, the deflection of the Galvanometer’s 
needle depends on the direction of the movement
of the magnetic field.
if the magnet is moving towards it, then it 
will deflect to one direction and when the
magnet is moved away from it, it will deflect 
to the opposite direction and when both the
magnet and the coil are at rest, there will 
not be any deflection in the Galvanometer.
You can also deduce deflection in the Galvanometer’s 
sign when the current is flowing in the other
coil is placed closeby.
This deflection is observed only during the 
starting of the passing the current or when
we stop it.
There is no deflection when the current is 
in the steady state in the other circuit.
So, you can induce a current in a coil either 
by changing the magnetic field by moving a
magnet as you have seen in the previous case 
or by changing the magnetic field.
It is very convenient in most of the cases 
to move the coil itself in the magnetic field.
The induced current is found to be highest 
when the direction of motion of the coil is
at a right angle to the magnetic field direction.
If the forefinger shows the direction of the 
magnetic field and thumb shows the direction
of the motion then the middle finger shows 
the direction of the current and this is given
by right-hand rule.
