March+Homework+AP+C

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= March 2014 Week 4 =

Lab on Wheatstone bridge and PS 3.7 all due Monday March 31

a) Watch the 15 minute video at [] on charging capacitors. Show on looseleaf how Kirchoff's Voltage Law and calculus is used in the video to derive the equation for the capacitor charge vs time. Also explain what the "time constant" is for a capacitor. {stamp Tuesday or Weds} 10 pts b) lab calculation: for any 3 data points, see on looseleaf how close your voltage comes to the charging capacitor formula. 10 pts c) UTexas on Kirchoff's Law 80 pts


 * March 2014 Week ** 3

a) Read Ch 28 and answer all 5 Checkpoints b) problems from textbook p. 693 #16, p.694 #32, 695 #38 and 43 Up to 3 stamps Thursday. Test on CAPACITORS ONLY on Friday 3-21

= Friday March 14: =

Hand in stapled __homework__ to sub. Work on new __UTexas__ homework **//Capacitors C,//** which closes Monday night, counts as PS 3.5.

Week 2: Capacitors & Circuits 1

a). Read chapter 26 and answer the checkpoints as you read (stamp Tuesday) {10 points} b). Movie from MIT on spherical capacitors by Prof. Lewin at [] While watching, write out the following on 1 whole separate side of looseleaf paper: Draw the capacitor he draws, write the equations he writes, and then add the 2 things that he leaves to you to derive: __derive E between the cylinders__ of a spherical capacitor using Gauss' Law AND take the integral of __Edl to derive the voltage__ formula between the spheres.(stamp Weds) {10 pts} c) Fifteen problems from the textbook: page 646-650 #3,6, 7, 9, 10, 14, 16, 18, 33, 35, 36, 52, 5356, 66. Show formulas used and algebra. {60 points} d) Test 3.2 corrections & the problem you skipped. Please show derivations as in textbook or powerpoints. {10 pts} e) Worksheet on capacitance (maybe - if we get to it this week)

Ch 24 Gauss' law: Stamp Tuesday a. p.594 Questions 1, 4. b. p. 595 Problems 2, 3. p. 596 #6, 7, 17, 18, 19.

Ch 25 Electric Potential. If half done early, second stamp Tuesday. c. p. 601. Why is the girls hair standing up? d. p. 618-619, Questions 1, 3, 4, 5 Stamp Monday e. p. 620 #15. f. Exercises & problems p. 621-627 # 22, 33, 37, 44, 74, 75 (added from Monday's work)

=__Test Friday__ Mar 7 on Gauss' Law and Potential (voltage) including different shaped charge objects=

= =

=**SUNY New Paltz Applications and checks are now due Weds Mar 5th**=


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=== and answer the 4 checkpoints embedded in the readings. Due Thursday Feb 27 ===

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**PS 3.2 A (50 points):** Read chapter 25 on Electric Potential =====

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and answer the 7 checkpoints embedded in the readings. =====

Lab on GYROSCOPE due Friday Feb 7. **Week 2 : Feb 14: pd 2 Test on paper in class. Pd 3 start online UTexas test and finish it over the weekend.**

= =

=**First electricity test Thurs & Friday Feb 13 & 14. See the Notes & study page for details.**=

=Electric Charge PS 3.1 DueWednesday 2/12=

Stamp Tuesday - Triangle problem a. Read Chapter 22 and do the **checkpoints**. (30 pts) b .Answer the following from the end of chapter 22;

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‍Questions **# 3,4, 5, 7. 8. 9** on page 548-9 (25 pts)======

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‍Problems # **6, 9, 10, 20, 25, 35 (25 pts)**======

c, MIDTERM Corrections (20 pts) Our first test in electrostatics will be at the end of the second week in February. 1

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Week 4: Easter-Passover Break
We wll take our next test on Circuits using Kirchoffs laws, including capacitors on Thursday April 4. The March Notes & Study page has movies, notes & practice problems.

If you want to get further ahead you can b egin the study of magnetism either by a) reading Ch 29 & 30 or b) watching these videos [] []

Week 3 : RC Circuits: PS 3.7 Due Friday 3/21
(note: if you are absent this week or are using a late hwk pass, I will leave UTexas open and you can hand this in the day you return after Easter) a. Handout #1 Find the current in each branch of the circuit. Worth **10 pts** b. Utexas: done partly in class & partly at home. Get 9**0 raw** points out of 100 for maximum credit. **80 pts** The last 2 questions should wait until we have covered a new equation for the time needed to charge and discharge a capacitor on Thursday & Friday. If you are not here for that a good online lecture video is here: []

c. Explain the mathematical theory behind the Wheatstone Bridge and why the resistance ratio equation works to find an unknown resistor. Show how the formula can be derived from equations we have already used in class. Explainations can be googled are online using the term Wheatstone Bridge **(10 points)**

Lab: Build a ** Wheatstone Bridge ** as shown on youtube at [|www.youtube.com/watch?v=qebl2kNsDZo] Once built, use the formula to find the resistance of the unknown resistor. Lab report due after break.

Over the Break:

**Test alert: question #17** on test A ( thats #7 on test B) should have **C** as the correct answer, not D. The work done to separate oppositely charged plate is stored as potential energy; C halves, V doubles, E and q and sigma are constant, but U = 1/2 CV^2 yields a doubling of stored energy. See me if I owe you points. =Week 2: PS 3.6 Advanced DC Current * Due Friday March 15= a. Test Corrections (10 pts) b. Read Chapter 27 and answer the checkpoints (30 pts) Master the techniques of DC circuit analysis in the video under Ch 9 lesson 31 at [] Then add capacitors in RC circuits by mastering the techniques in the video under Ch 9 lesson 32 at [] c. Problems at end of chapter (60 pts) 1. CURRENT DENSITY page 669 exercises # 6 & 7 2. CONDUCTIVITY page 617 #17 & 18 3. POWERpage 671 #48 & 40

=Week 1 * Test and Homework 3.5 both for Monday March 11= // From Friday March 1 // a**.** Learn about capacitors by watching the 14 minute **video** at [] b. **On looseleaf** draw the parallel plate, cylyndrical and spherical capacitors as you saw them in the video, Under each drawing give their unique electric field, voltage and capacitance equations based on their geometric variables (like radius,length, width separation etc). STAMP for this on Monday.

c. Answer the six Checkpoints for chapter 26 on capacitance. =** d. Answer the following 15 textbook questions/problems **= =** page 645 #4, 6 14, 15 **= =** page 646-649 #2,3, 5, 6, 17, 18, 19, 33, 52, 57, 66 **=

**Test Monday March 11:** Gauss's Law, Capacitors.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ FUTURE WORK ^^^^^^^^^^^^^^^^^^^^^^^^^^^

Week 2 Ch 27 Current and Resistance and Ch 28 Advanced Circuit Theory

Week 3 Ch 29 Magnetism and Ch 30 Magnetic Fields Created by Current

Easter Break