HP Cycle 37

4/25 - 4/30

Th 4/25

F 4/26

M 4/29

T 4/30

🟢 5: Th 4/25 - 🔄 induction & Lenz's Law

If moving charges produce magnetic fields, can magnetic fields move charges? Today, we'll learn how we can produce a current in a wire loop by changing the magnetic field through it. We'll introduce Lenz's Law and look at 3 (or really 4) steps:

We'll do some practice with Lenz's Law.

Watch all of "Intro to Induction and Lenz's Law."

Presentation:  Lenz's Law

Then, each person is assigned just one problem from "Lenz's Law Practice Numbered". The answers are provided on the worksheet in parenthesis [(cw) for clockwise, (acw) for counter- or anti-clockwise]. There is a video link provided at the top of the document if you want examples of solutions. Check the post in ✏️ Google Classroom to find your assignment. Log onto 🔄 Flipgrid using the link attached in ✏️ Google Classroom (should be able to click "Log in with Google" using your school wwprsd account, but manually create an account with your wwprsd email if you need to). And post your video solution. There's a 1 minute and 30 second maximum time for your video, but that should be plenty of time; my example video you see attached to the assignment in Flipgrid is only 45 seconds. You don't have to show your face on the video - just talk through the problem solution and show your right hand. Watch a few other peoples videos if you want or practice other problems from the document. Rewatch your video before posting to make sure that it is not backwards from the viewer's perspective.  Hit Submit on this assignment in ✏️ Google Classroom. That's it for the assignment! 

Homework:  📖 Mastering Physics due tonight at 10pm.  QUIZ on all of magnetism up to this point (chapter 24 without the equations in 24.4 or 24.7, does not include induction or Lenz's law) next class - Friday, April 26th.   Lenz's Law assignment due in 🔄 Flipgrid by Sunday, April 28th at 10pm.  

🟩❗ 5: F 4/26 - 📖 Faraday's Law

Magnetism QUIZ Today!

Today, after the quiz, we'll introduce the quantitative formula for flux in a uniform magnetic field: ΦB = BAcosθ. We'll see how we can quantify the current created by a changing magnetic flux in a loop by looking at Faraday's Law: ε = -N ΔΦB/Δt where I = ε/R (Ohm's Law).

First watch the "Faraday's Law" video. 

Then, we'll practice induction problems by doing 📖 Mastering Physics "Ch 25 - Faraday's Law" problems: #C9, C12, C16, MC27, 9, 14, 16,17, 20, 21, 23. 

Homework:  Finish the above 📖 Mastering Physics problems by Tuesday, April 30th at 10pm.  Unit Assessment on all of Electromagnetism (everything since we started talking about charging and electrostatics, including circuits, magnetism, and induction) on Thursday, May 2nd.  

💚 5: T 4/30 - 📖 motional emf

Today, you may start by finishing any 📖 Mastering Physics "Ch 25 - Faraday's Law" problems you have not finished.  These problems are due tonight at 10pm.

Then, we'll take a look at a moving bar in a magnetic field which will produce a motional emf.  Using what we learned last time about Faraday's Law, we'll derive an equation that can help you understand this relationship.  (Faraday's Law, ε = -N ΔΦ/Δt and I = ε/R (Ohm's Law)).  Watch the video.  

Then, we'll practice motional emf problems by doing 📖 Mastering Physics "Ch 25 - motional emf" problems #C3, C18, 4, 7, 62, 65.  

Homework:  Finish the above 📖 Mastering Physics problems by Wednesday, May 1st at 10pm.   Unit Assessment on all of Electromagnetism (everything since we started talking about charging and electrostatics, including circuits, magnetism, and induction) on Thursday, May 2nd.  

Optional Extra Practice:  Read any sections in chapter 25.1-3 that seem unclear.  Then do at least #11-12 of page 2 of FYP: Electromagnetism  (ANSWERS). The video will help you with these two problems.