HP Cycle 37

🟢 8: F 5/1 - current creates magnetic field

Then, we'll practice with concepts of a magnetic field created by a current by doing problems.

Homework:  Finish these problems.  QUIZ on all of magnetism up to this point on Tuesday, May 5th.

Optional Extra Practice:  📖 Mastering Physics "Ch 24 - current creates magnetic field" conceptual and multiple choice problems: #C8, C9, C10, C13, C24, MC30, MC31, P68.  

🟩❗8: M 5/4🌰 - study for quiz

Today, you'll study for your quiz on all of magnetism up to this point:

• all 4 right hand rules

• force equations

• mass spectrometer (including velocity selector)

Homework:  Study for QUIZ on all of magnetism up to this point next class - Tuesday, May 5th.

💚 8: T 5/5🌰 - 🔄 induction & Lenz's Law

QUIZ on all of magnetism (no induction) TODAY.

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:

1. 1. Is there a changing number of magnetic field lines (aka magnetic flux) in the loop of wire?

   2. How are the field lines changing? ("more/less lines to the right" for example)

   3. The induced field opposes that change. ("more lines _____" opposite #2)

   4. Use the right hand rule for the electromagnet/solenoid. (thumb = induced field, fingers curl = current)

Then, we'll do some practice with Lenz's Law.  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 🦜 Padlet 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. Keep your video less than 90 seconds, but that should be plenty of time; my example video you see attached to the assignment in Padlet 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. Remember to use the phrase: "By Lenz's Law, the induced magnetic field opposes the change in magnetic flux, so in this case..." 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:   Assignment due in 🦜 Padlet by Thursday, May 7th at 10pm.