What did Maxwell have to offer to the work done by Faraday? You should have an idea about that after today. You should also know a bit more about light, especially that electromagnetic waves make a good model for light.
What is polarized light, and what kind of wave describes light, longitudinal or transverse? Assignment (actually going to be due on Tuesday, April 2):
We reviewed by taking a look at the Practice Test.
Assignment:
We finished up our presentations today.
Assignment:
Transformers were the topic du jour. We should understand that transformers function because of AC current; they would not work with DC current. Can you explain why?
Transformers can step up voltage, and they can step it down. Designed so that the power put into the transformer is equal to the output power (as closely as possible, of course), if the output voltage is stepped up, then the output current is reduced by the same factor. Assignment:
The main features of today's lesson were phenomena that arise from Faraday's Law and Lenz's Rule. Eddy currents were one of the major phenomena that occur due to the induced emf's created by changing magnetic fields around and inside conductors like copper. Assignment:
Today we discussed solutions to our assigned problems. And that meant a discussion of Lenz's Rule.
Assignment:
Lenz's Rule for determining the direction of flow of induced current was on display today. For example, you should be able to determine whether the induced current in the loop of wire depicted below will flow clockwise or counterclockwise as the external magnetic field (blue tail feathers) passing through it diminishes as time goes by from frame 1 to frame 3.
Michael Faraday's work was the topic of today. Do you know what he figured out on his own? The same thing that the American Joseph Henry figured out even before he did, namely that electric currents can be created by using magnetic fields, if changes in magnetic flux occur. Why did Faraday get all the credit? Because he published first, and he worked on what he found further and in more detail. Henry was first, but Faraday did more. Neither one knew of the work done by the other until after the fact; they worked independently.
Assignment:
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Physics IIMr. Swackhamer Archives
May 2019
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