1. Objective
The objective of this lab is to examine the induced voltage generated by rods and
magnets in a coil and to apply Faraday’s Law to define the value of EMF and look
at its dependency on the magnetic field,
...
1. Objective
The objective of this lab is to examine the induced voltage generated by rods and
magnets in a coil and to apply Faraday’s Law to define the value of EMF and look
at its dependency on the magnetic field, frequency, angle between the axis and
direction of the magnetic field.
2. Description
We used Capstone to observe the changes in voltages through the graphs and
the RLC circuit board, coils and iron rod to test Faraday’s Law in different
scenarios.
3. Procedure
First, we used an iron rod and a magnet to move them in and out of the coil and
recorded a graph. We moved the rod at different speeds and dropped the
magnet. Next, we recorded the graphs of a moving coil with steady current and a
moving coil with switched currents. Then, we reversed the two leads from the
power amplifier to the coil, moved the coils apart, and passed the iron rod
between the coils. Then we made a handmade coil and sent the magnet back
and forth through the coil and observed the voltage polarities.
4. Questions and Answers
Why is there a negative sign in Faraday’s Law?
The negative sign in Faraday’s Law expresses Lenz’s Law which expresses
the conservation of energy.
How can you determine the magnetic pole that is being inserted into the coil?
Explain.
We follow Lenz’s Law because it states that the direction of the induced
current in the loop opposes the change in the flux.
Try not moving the magnet at all. Is there an induced voltage? Explain.
Yes, there is still an induced voltage, there is always an induced voltage
between the magnet and the coil.
Turn the axis of the magnet perpendicular to the axis of the coil and bring the
magnet down onto the coil. Across the coil is there an induced voltage?
No.
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