E-801
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EXPERIMENTS Induction of electric current
Purpose Procedure
To demonstrate the induction of electrical current from a
1. Connect a coil with 400 windings to a coil with 1600
coil due to a changing magnetic field
windings, as shown in figure 1.
2. Insert the galvanometer accessory into the coil with
Theory
1600 windings.
When the magnetic field around a coil changes, an ele c-
3. Now move the bar magnet down into the coil with
trical potential is induced in the coil. The induced
400 windings and observe the deflection on the
voltage can cause a current to flow if the coil is
galvanometer. Note that the current changes directi-
connected to a circuit. The direction of the current flow
on when the magnet is drawn upwards out of the coil.
will induce a field around the coil which opposes the
Reverse the direction of the bar magnet so that the
change in the original magnetic field.
opposite pole points downward, and repeat the
experiment. What do you observe?
By conducting this experiment it can be shown that the
rate at which the change in the magnetic field occurs
4. By moving the magnet quickly or slowly in and out of
influences the strength of the induced electric current.
the coil one can observe the connection between the
Furthermore it can be shown that the number of win-
rate of change of the magnetic field and the induced
dings in the coil influences the strength of the induced
current.
current.
5. In order to investigate the effect of the number of win-
dings on the magnitude of the induced current, place
an additional coil (with 800 windings) in series with
the two other coils (so that the total resistance in the
circuit remains the same during the experiment).
Now try using uniform motions of the bar magnet to
study the effect the different number of windings has
on the magnitude of the induced electrical current.
Required Equipment
4625.20 Coil, yellow, 400 wdg. 1.00 Pcs
4625.25 Coil, grey, 800 wdg. 1.00 Pcs
4625.30 Coil, red, 1600 wdg. 1.00 Pcs
Fig 1
4640.00 Galvanometer insert 1.00 Pcs
3305.10 Bar magnets, Al-Ni-Co 1.00 Pcs
Cables
®
Science Equipment for Education Physics
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