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Phy122_1005 - ch.19

# Phy122_1005 - ch.19 - Physics 122 5 October 2010 Hello Im...

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Physics 122 5 October 2010 I’m Prof. Koch, and you know me from PHY 124, the lab part of this course. It’s my pleasure to be the lecturer here for the next month or so. Today we continue chapter 19. None of the Ch. 19 material will be on your 1 st midterm exam tonight: 8:30-10:00 PM Midterm exam on Ch. 15-18. barb4right Last names beginning A-J: Old Engineering 145 barb4right Last names beginning K-Z: Old Chem. 116 Bring a calculator, pencils, erasers, and one 8½” x 11” page (both sides OK) of notes – you choose content. Take it and the exam sheet home. Suggestion: Quickly read the whole exam. Start with the easier problems. Leave the harder ones to the end. 6 October (tomorrow) 5:00 PM: HW on Ch. 19 is due.

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There are a number of links in this set of slides adapted for posting on the PHY 122 web site via Blackboard. I have converted the original ppt slides to pdf, but done in such a way that the links remain active. Use the free Adobe pdf viewer, and you should be able to find the links to be active. It worked for me in ver. 9.3 of the free Adobe pdf viewer. Put the Adobe “hand” cursor on the link and click. They may or may not be active for other pdf viewers. I Question 1: this the customary freebie tried them with the free Foxit pdf viewer and found they wouldn’t open. These links will help you (re)understand the lecture I gave on 5 October 2010.
Question 2 is motivated by Lab 3: R1=100 ohm (+/-5%) and R2=75 ohm (+/-10%) are connected in series. Calculate ΔRseries. ΔR1=0.05 x R1 = 5 ohm; ΔR2=0.1 x R2 = 7.5 ohm. ΔRseries = sqrt((ΔR1)^2 + (ΔR2)^2) = sqrt((5)^2 + (7.5)^2) = 9.0 ohm.

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Moving charges in a conductor feel the same magnetic Consider a wire of length L . q v = Charge = Current x Distance = I L So F = I L B sin θ . Same right hand rule of I , B , F. distance time See part of video (url below), answer question, then see rest. http://www.youtube.com/watch?v=tUCtCYty-ns&feature=channel
Question 3: Start the video from the preceding slide and stop it before the switch is closed. The front magnet pole is N; the back pole is S. If, when the switch is closed, current will go from left to right, will A) the wire will jump toward the S pole? B) the wire will jump toward the N pole? C) the wire will jump up? barb2left correct D) the wire will jump down?

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At the end of the previous lecture, we were considering the torque exerted on a current loop placed in a magnetic field and free to rotate about an axis through O. The diagram below gives a pictorial reminder.
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Phy122_1005 - ch.19 - Physics 122 5 October 2010 Hello Im...

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