AT Cycle 29
3/7 - 3/10
🔴 1: M 3/7, 🟡 3: M 3/7 - Ampere's Laws AP problems (2)
Today, we'll start AP problems and do some AP multiple choice.
* Add the following part to the 1983E3 problem:
(c.) (i.) Find an expression for the force per unit length between the two wires. (ii.) Is this force attractive or repulsive?
ANSWER: (c.)(i.) F/ℓ = μ0 I1 I2 / (4πa). (ii.) attractive
Multiple Choice Answers: 19-E, 47-D, 68-C, 65-D, 50-E, 42-E
Then, we'll do some Ampere's Law problems from the textbook:
Required: Halliday Ch 29 #35, 49, 52, 53, 54
Homework: Upload pictures of your solutions to the 2 AP problems and textbook problems above to ✏️ Google Classroom assignment due Wednesday. Review induction concepts for next unit by watching videos on my AT Induction Review page.
🟥 1: W 3/9 lab, 🟨 3: T 3/8 lab - JJ Thomson's experiment
Today, as our daily quiz, we'll do some practice with a mass spectrometer. Upload your screenshot to ✏️ Google Classroom by Wednesday at 10pm.
Then, we'll use a simulation of a cathode ray tube to repeat the 1897 experiment by J.J. Thomson to find the charge-to-mass ratio. (It's actually not exactly the same, but there are similar elements.) Find the experiment in ↩️ Pivot Interactives called "JJ Thomson Experiment - finding charge-to-mass ratio." In this lab, you will combine your knowledge of electrostatics, magnetism, and circular motion. This lab is due in Pivot on Thursday, March 10th at 10pm.
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.
Support on derivation of magnetic field in Helmholtz coils. Also, see Giancoli Chapter 28 #58 previously assigned.
With any time remaining, finish the problems from this magnetism unit, find additional AP problems on magnetism, or continue your review of all of the induction topics you should have learned last year on my AT Induction Review page.
Homework: Complete the mass spectrometer activity in ✏️ Google Classroom by Thursday at 10pm, and complete the charge-to-mass ratio lab in Pivot by ↩️ Thursday, March 10th at 10pm. Unit Assessment on all of Magnetism Friday, March 11th.
❤️ 1: Th 3/10, 💛 3: W 3/9 - induction review
If you have not yet completed JJ Thomson's experiment, please make sure you have a good handle on that. This lab is due Thursday at 10pm.
In groups today, we'll try to compile a list of facts and equations that you should know about induction. We'll collect all of the ideas and make sure you understand the following:
Lenz's Law (to find direction of induced current)
Faraday's Law of Induction (to find magnitude and direction of induced current)
Motional e.m.f. (moving bar through magnetic field)
Transformers (ideal transformer equation)
how motors work
how generators work
Take notes on all of above and upload pictures of your notes to ✏️ Google Classroom assignment due Monday at 10pm.
Homework: Make sure you have reviewed all of the induction topics you should have learned last year on my AT Induction Review page. Upload pictures of your induction notes to ✏️ Google Classroom assignment due Monday at 10pm. Unit Assessment on all of Magnetism Friday, March 11th. (Test does not include induction.)