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Wednesday, April 26, 2017

EM Work

For review, let's go into the AP Multiple Choice folder on your chromebook, and try the 2015 test (if this link does not work, go to the AP Exams folder and then into the Mult Choice folder). Remember you need to be logged into your eths202.org account to access these folders. You'll need to scroll down in that file to get to the questions, and the answer key is towards the end of the file.

It is up to you if you want to start by yourself and then work with others on anything you missed, or if you want to talk through things with one or two others. If individually, also keep a sense of pace by timing yourself for some number of questions.

*The important thing is to find things that you have forgotten or have had some trouble with in the past. Turn in your answer sheet and score. Whatever time you have left, you can work on the review set from the other day. Come with questions Thursday!  😊

Wednesday, April 19, 2017

Visitor on Tuesday, April 25: Robin Chaurasiya

Check out a brief bio of Robin Chaurasiya, who will be in town and visiting ETHS on Tuesday, April 25, in room H322. Come by during lunch periods to meet her and hear some thoughts about what she does in India with her students. There is also a good video showing what the girls do in terms of performance at the Kranti School.

Tuesday, April 11, 2017

PhET simulation for EM induction

We will be trying the generator and transformer simulations for class. Check it out! The link is https://phet.colorado.edu/en/simulation/legacy/faraday.



Monday, April 10, 2017

Inductor Circuits!

We are moving into the final topic of high school physics: Inductors!

Check out a few videos if you need to review or double-check anything:

- series RL circuit
- Parallel RL circuit 
- LC circuit 

- Maxwell's displacement current, about how capacitors work and the final piece to Maxwell's equations
- Maxwell's equations (Mechanical Universe episode; good graphics of EM waves)

Tuesday, April 4, 2017

EM Induction Links

For Tuesday:

Check out the case emf = B dA/dt, where the circuit moves and the area changes. This is an example of a magnetic brake, where the loop will start to slow down due to the weird induction phenomena.

Then, a special example of this type of induction, where the circuit falls through a magnetic field (in other words, when there is a constant force trying to accelerate the circuit/loop. This is going to end up looking a lot like air friction on a skydiver, with a terminal velocity!

By the way, check this one out if you want to see a strange case of finding the magnetic flux through a circuit due to the magnetism from a long, straight wire next to the circuit.

On Wednesday, which you have off, check out a preview of the other case, where emf = A dB/dt. This is going to involve a circulating electric field! Weird, but welcome to the world of electromagnetism. Here is a video specifically on the circulating E-field that is created when there is dB/dt.    :-)