# HP Cycle 42

## 5/26 - 6/1

Th 5/26

F 5/27 *SNOW

T 5/31

W 6/1

### π’ 6: Th 5/26, π΅ 8: Th 5/26 - β current creates magnetic field

Senior Lunch Cruise.

Today, we'll learn how moving charges create magnetic fields. We'll learn the last two right hand rules.

First, watch my video on "Current Create Magnetic Fields." It's a rather long video, but you can probably speed up parts of it. I recap the most important parts of the embedded videos, but watching the embedded videos will really build your understanding.

Then, we'll practice mass spectrometer problems by doing β Positive Physics unit 27: electromagnetism "work" problems from the sections:

• right hand rule 1

• right hand rule 2

Homework: Finish these β Positive Physics problems by Wednesday at 10pm. Only completion score counts. No late work will be accepted. QUIZ on all of magnetism up to this point on Thursday, June 2nd.

Optional Extra Practice: Textbook chapter 19 conceptual questions 21-24 (answers)

### π© 6: T 5/31, (π¦ 8: F 5/27 *SNOW) - extra practice

Practice magnetism with Optional Extra Practice: FYP: Electromagnetism #1-10 (ANSWERS). Optionally read parts of chapter 19 - particularly sections 19.6, the first section of 19.7 (skip Electromagnets and Magnetic Permeability), and 19.8. You will not be responsible for any of the equations in these sections. Then do conceptual questions 17-19, 21-24, and 26 (p 688). (answers)

Homework: QUIZ on all of magnetism up to this point on Thursday, June 2nd.

### π 6: W 6/1, π 8: T 5/31 - π 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:

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)

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

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

Presentation: Lenz's Law