AP Central (College Board Site) - AP Physics C Mechanics, AP Physics C E&MIf you need more support for physics basics, go to YouTube and search the topic with one of the following: Khan Academy, vkiledj, or Dan Fullerton (or APlusPhysics). Lesson objectives in Orange. |

### Advanced Topics in Physics

#### How did JJ Thomson find the charge-to-mass ratio for an electron?

F 3/1 Today, after our daily quiz, we'll use a cathode ray tube to repeat the experiments of J.J. Thomson. In doing so we'll review how a charged particle behaves in an electric and a magnetic field. For the next class, write in your journals the derivation of the magnetic field from a coil and your calculated value for q/m. List at least 5 sources of possible error. Your calculated value should be within an order of magnitude of the accepted value. To get a visualization of the magnetic field between Helmholtz coils, check out this video, where you can see that in the center region, the magnetic field is fairly uniform. Homework: Study for exam on magnetism next class - Monday, March 4th. |

#### How do you solve more problems with Ampere's Law?

W 2/27 labToday, after a daily quiz, we'll finish the required AP problems and do some AP multiple choice. Then, we'll do some Biot-Savart and Ampere's Law problems from the textbook: Required : ch 28 - 22, 23, 24, 26, and pick a couple problems from the problem section 28-6 at your level of math, 12, 14, 18, Homework: Finish all problems from previous posts. If you have any questions, write them down. Exam on magnetism will be Monday, March 4th. |

#### How do we solve problems using Ampere's Law? How can we find an expression for the magnetic field inside and outside of a slinky?

T 2/26 labDaily Quiz: Ampere's Law 3Today, start by finishing any problems that you didn't finish from the textbook. Then, we'll use what we've learned about Ampere's Law to solve some AP problems. Then in the second half of lab, in lab groups you'll run current through a slinky and qualitatively try to figure out which variables affect the magnetic field. As a class we will use your observations to determine the equation for the magnetic field inside of a slinky. With any time remaining, you'll have a choice. You can catch up on videos that you haven't watched, you can find more AP problems online, you can do more problems from the textbook on Biot-Savart, or you can work ahead. Homework: Watch the following video on finding the magnetic field inside a solenoid and toroid. I'm sorry this video is so much longer than normal (31 minutes), but my hope is that we talk about a lot of this stuff in class, especially when it comes to the solenoid. Definitely watch the last part about the toroid: |

#### How do you solve problems with Ampere's Law?

M 2/25Daily Quiz: Ampere's Law 2Today, start by finishing any problems that you didn't finish from the textbook. Then, we'll use what we've learned about Ampere's Law to solve some AP problems. Homework: Watch the following video showing two more examples of Ampere's Law. After you watch both examples, finish the second example by finding the magnetic field as a function of r outside of the wire and finish the B vs. r graph. |

#### How can you solve Ampere's Law problems?

Th 2/21Daily quiz: Biot-Savart 2Today, after watching the homework videos below, we'll work on some Ampere's Law Problems. Chapter 28: Required: 27, 28, 7, 9, 12, 15, 16, 18, 19 Enrichment: 20 With any time remaining, work on AP Problems from the next post. Homework: Make sure you've watched the first two Ampere's Law videos which were in the last post. Then, watch the following videos on examples of the application of Ampere's Law. The first example is how to find the magnetic field inside a current-carrying wire. Can you find the magnetic field outside the wire? Try this problem and finish the graph that lasseviren1 started - B vs. r.Check your answer starting at 4:20 of the next video, and then watch the rest of the video which gives an example of finding the magnetic field in a coaxial cable. |

#### How do you apply the Law of Biot-Savart?

W 2/20 labDaily Quiz: Biot-SavartToday, you'll utilize what you learned from the video last night in order to calculate the magnetic field due to a current-carrying wire. You'll look at problems from section 28-6 of your textbook, apply your problem-solving skills, and collaborate with your classmates to solve difficult problems. Required: 30, 31, 58, 34, 36 Enrichment: 40, 41 We'll do corrections on the circuits test. If there's time remaining, watch the homework videos below. Homework: Watch the following videos on Ampere's Law. In the first video, lasseviren1 reviews Gauss's Law in order to draw an analogy to Ampere's Law. If you really understand all of the intricacies to Gauss's Law, you'll have a much easier time understanding Ampere's Law. In this second video, lasseviren1 reviews the same problem he did in the last video, but highlights a couple of details that he rushed through. If you've already watched the videos above, move on to the following examples of the application of Ampere's Law, which you need to watch before solving problems. The first example is how to find the magnetic field inside a current-carrying wire. Can you find the magnetic field outside the wire? Try this problem and finish the graph that lasseviren1 started - B vs. r. Check your answer starting at 4:20 of the next video, and then watch the rest of the video which gives an example of finding the magnetic field in a coaxial cable. |

#### How well do you understand circuits with resistors and capacitors?

T 2/19EXAM Today on Circuits!Homework: Finish problems from AP problems for force by magnetic field. Watch the following videos on how to use the Biot-Savart Law which was introduced in class. |

#### What do you remember from last year about magnetism?

Th 2/14LAB QUIZ on Series & Parallel Circuits TODAY!Today we're going to discuss things we know, think we know, and want to know about magnetism. We'll review all of the right hand rules and check our understanding with many examples. Afterwards we'll review equations for the force on a moving particle by the magnetic field and force on a current carrying wire by the magnetic field. We will test our understanding with a couple of demonstrations. We'll discuss applications including the mass spectrometer. Then, we'll work collaboratively on the problems from AP problems for force by magnetic field in order to understand how the force equations are applied. When you finish, you'll look in the textbook for additional problems to practice - Chapter 27. If you feel really comfortable, try some of the level III problems. Otherwise, you may focus on the level II problems. At the end of class, I'll introduce the Law of Biot-Savart.Handouts: AP problems for force by magnetic field (MC ans: CADEEACDA) Homework: Problems from AP problems for force by magnetic field need to be done by Wednesday, February 20th, so make some headway over the long weekend.Study for RC Circuits Test next class Tuesday, February 19th! |

#### How do you solve RC circuits problems?

W 2/13 labAfter the quiz, we'll play catch up. - If you haven't completed any of the labs from this unit, do that first.
- If you haven't finished all of the required problems from this unit, you'll be finishing those today including:
- Chapter 26, #41-43, 2007E1, 2006E2, 1996E2, 2010E2
- 2002E2, 2003E2, 1986E2, 1988E2, 1989E3, 2007E1.
- Chapter 26 #1, 2, 4, 2015E2
- Make sure you've gone back and re-done all of the problems involving energy and dielectrics.
- Try Circuits Multiple Choice (ANSWERS)
- If you finish all of the required problems from this unit, do more AP Problems.
Homework: LAB QUIZ on Series & Parallel Circuits next class - Wednesday, February 13th. If you are planning on taking the AP Exam, take a look at this additional useful information on circuits that Mr. Sierzega put together. Think about what you remember about magnetism. Jot down some notes on what you already know. Watch this video to jog your memory from 0.00-3.23 only. Also remember basics about magnetic poles (opposites attract), what causes magnetism in general, and what you know about magnetic field of the Earth and what causes it.RC Circuits Test Tuesday, February 19th, but we'll start new material before then!Then watch the following video, and write down any questions you have about how it works: |

#### What are EMF, internal resistance, and terminal voltage of a battery?

Today, we'll do a lab where we explore the terms: emf, internal resistance, and terminal voltage. After finishing the lab, do textbook problems Chapter 26 #1, 2, 4. Then do 2015E2 to check for your understanding. Watch the homework videos first if you prefer. Handouts: EMF & Internal Resistance LabHomework: Finish the internal resistance lab. If you have any trouble understanding the analysis, watch the following video:Then watch this video on maximizing the power for an external resistor: |

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