The objective of the experiment is to analyze the
mechanisms involved in Faraday’s law and Lenz’s law of induction and
electromagnetic induction set-up.
In the experiment we made use of a galvanometer,
power supply, large and small solenoid, bar magnet, aluminum metal rod and an iron
rod.
The experiment consists of
four parts. In the first part of the experiment, the direction of deflection of
the galvanometer was examined. It was connected to a power supply and a large
resistor. For the large resistor, the human body was considered. The direction
of deflection that the pointer of the galvanometer made was recorded. The
current was reversed and the change in the direction of deflection was also
noted.
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| Galvanometer |
In the second part of
the experiment, the effect of magnetic flux to the induced current in a
solenoid was studied with the use of galvanometer. The terminals of the
solenoid were connected to a galvanometer. A bar magnet was moved in and out of
the solenoid and the corresponding magnitudes displayed by the galvanometer was
recorded. The speed in which the magnet was moved was increased and the
corresponding magnitudes were also gathered. The other pole of the magnet was
then used and analogous data were taken following the same procedures.
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| Bar magnet inside solenoid |
In the third part of
the experiment, a small (primary) solenoid was placed inside a larger
(secondary) solenoid making sure they are insulated from one another. The
galvanometer was connected to the secondary solenoid while the power supply was
connected to the primary one. The power supply was turned on and off and the
corresponding magnitudes produced were gathered. An iron rod was placed inside
the primary solenoid and the same procedures were made gathering the magnitudes
produced. The iron rod was replaced by an aluminum rod and analogous data was
taken following the same procedures.
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| Magnetic field lines of a solenoid |
In the last
experiment, the same set-up from the third experiment was prepared. Inside the
primary solenoid was an iron rod. The primary solenoid was pulled out of the
secondary solenoid with 1cm increments taking note of the magnitude displayed
in the galvanometer in every increment made. A graph of the length of the
primary solenoid versus its magnitude was plotted and analyzed.
It was found out that the galvanometer responds
to a change in current and reversing the current displays an opposite direction
of deflection and Faraday’s law and Lenz’s law were proven true. It was
confirmed that current-carrying wires produce a magnetic field and a complement
of magnetic objects increases the current produced and that the number of coils
in a current-carrying wire is directly proportional to the magnetic flux.
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