Figure
1 above is used to demonstrate electromagnetic induction (mutual inductance).
In this arrangement, relative motion between the magnetic lines of force and
the electric conductor is achieved without mechanical motion of either the
magnet or the electric conductor.
As we
reduce the resistance of the rheostat, the current in the primary winding
increases. This causes an increase in the number of magnetic lines of force
appearing in the iron core. Since the secondary winding is wound on the same
core, the number of lines of force passing through the winding is increased and
a deflection of the galvanometer’s pointer indicates that voltage is being
induced into the secondary winding. Since most of the magnetic lines of force
are confined to the iron core, it is more usual for us to think of the flux as
linking the secondary winding instead of cutting across the turns of the
secondary winding.
reduce the resistance of the rheostat, the current in the primary winding
increases. This causes an increase in the number of magnetic lines of force
appearing in the iron core. Since the secondary winding is wound on the same
core, the number of lines of force passing through the winding is increased and
a deflection of the galvanometer’s pointer indicates that voltage is being
induced into the secondary winding. Since most of the magnetic lines of force
are confined to the iron core, it is more usual for us to think of the flux as
linking the secondary winding instead of cutting across the turns of the
secondary winding.
When
we increase the resistance of the rheostat to decrease the primary current,
the number of lines of force linking the secondary winding becomes smaller. At
the same time while the current was decreasing, the pointer of the galvanometer
swings in the opposite direction.
we increase the resistance of the rheostat to decrease the primary current,
the number of lines of force linking the secondary winding becomes smaller. At
the same time while the current was decreasing, the pointer of the galvanometer
swings in the opposite direction.
Again
when the primary is steady, there is no deflection of the galvanometer’s
pointer. The generation of a voltage in a secondary winding by changing primary
current is called mutual inductance.
when the primary is steady, there is no deflection of the galvanometer’s
pointer. The generation of a voltage in a secondary winding by changing primary
current is called mutual inductance.
