chanically. video Pendulum Magnetic Braking found uminum per um is initiall
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Transcribed Image Text:1. Eddy Currents and Magnetic Braking: You can think of a solid
conducting sheet as a set of conducting frames, one with in another, as
shown. Therefore there will be induced currents and drag forces where
the sheet is pushed in or out of magnetic fields. These currents are
called eddy currents.
Eddy currents are important when metal parts move quickly through a
magnetic field. For example, roller coasters are usually braked
electromagnetically using eddy currents since there is less wear than
braking mechanically.
Watch the video Pendulum Magnetic Braking found on our Canvas
page. An aluminum pendulum is initially free to swing between the
poles of a non-energized electromagnet. The pendulum comes to a
rapid stop when the current in the electromagnet is turned on.
a. Assume the pendulum swings counterclockwise into the
magnetic field as shown. The oval represents the eddy
currents that occur near where the pendulum enters the
magnetic field. Indicate, on the diagram, whether the eddy
current is clockwise or counterclockwise. Hint: Think of the
loop in the eddy current as a conducting ring being pulled
into the magnetic field.
b.
Draw an arrow showing the direction of the magnetic force
on the eddy current.
c. Repeat (a) and (b) for the case on the right where the pendulum is swinging out of the magnetic field.
d. Why does the pendulum slow down?
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