AT Cycle 29

🔴 1: Th 3/4, 🟡 3: Th 3/4a Lenz's Law Review

Today, we'll review Lenz's Law (presentation). We'll briefly discuss ways of inducing a current in a loop of wire. We'll review Lenz's Law which states, "An induced emf gives rise to a current whose magnetic field opposes the original change in flux." We'll see how we might use this concept to generate electricity to power a lightbulb. Then, see ✏️ Google Classroom to find the Lenz's Law problem you have been assigned, and explain your own example on 🔄 Flipgrid.

With any remaining time, you'll start problems from the next post on Faraday's Law.

Homework: Quiz on Ampere's Law Monday! Lenz's Law 🔄 Flipgrid is due on Monday at 10pm. If you need additional support, you can watch this video:

🟥 1: F 3/5, 🟨 3: Th 3/4b Faraday's Law review

Today, we'll explore Faraday's Law with simulations and video demonstrations. Record your observations for each simulation/demonstration in ✏️ Google Classroom by Tuesday at 10pm.

We'll start with two different on-line simulations from the University of Colorado PhET group.

INVESTIGATION 1:

First, link to the simulation: https://phet.colorado.edu/en/simulation/faradays-law

What happens when a magnet moves through a coil in which a current can flow?

Move the magnet at a relatively constant frequency back and forth through the coil. The voltage displayed is proportional to the current flowing in the coil. Watch the reading of the voltmeter. What happens

• as you move the magnet through the coils with different number of loops,

• as you change the frequency and therefore the speed of the magnet for a given number of loops, and

• as you change the polarity of the magnet?

INVESTIGATION 2:

Second, link to the simulation: http://phet.colorado.edu/en/simulation/faraday

Using the window called Pickup Coil, investigate what you can about induction. Make a list of variables that affect the amount and direction of the induced current. Qualitatively describe how these variables affect the amount and direction of the induced current.

❤️❗ 1: M 3/8a, 💛❗ 3: M 3/8 Faraday's Law Problems

Quiz on Ampere's Law TODAY!

If you have not finished your Lenz's Law 🔄 Flipgrid due tonight at 10pm or Faraday's Law ✏️ Google Classroom assignment due Tuesday at 10pm, start there.

Then, you'll work on some problems from the textbook Chapter 30 involving Faraday's Law:

Required: Ch 30 Questions #11, 12, Problems #2, 3, 7, 12, 13, 17, 18, 26, 96
Enrichment 26, 27, 28

Homework: Reminder Lenz's Law 🔄 Flipgrid due tonight at 10pm and Faraday's Law ✏️ Google Classroom assignment due Tuesday at 10pm.

📕 1: M 3/8b, 📒 3: T 3/9 Faraday's Law Problems

Today, you'll work on some problems from the textbook Chapter 30 involving Faraday's Law:

Required: Ch 30 Questions #11, 12, Problems #2, 3, 7, 12, 13, 17, 18, 26, 96
Enrichment 26, 27, 28

Homework: Reminder that Faraday's Law assignment is due Tuesday at 10pm. Quiz on Induction Review on Tuesday, March 16th. Watch the following video on the emf induced in a moving conductor. (If you need more information on how to derive the formula ε = BLv, check your textbook Section 30-2 or look at the picture of the excerpt from Giancoli below the video.):

Here are a couple other videos from last year that you may want to review on motional emf: