# AT Cycle 27

## 2/23 - 2/28

W 2/23

Th 2/24

F 2/25

M 2/28

### π΄1: W 2/23, π‘ 3: W 2/23 - β Positive Physics magnetism

Today, we'll practice all we've learned about work and energy by doing β Positive Physics unit 26: magnetism "work" problems from the following sections:

• Magnetic Fields

• Magnetic Force Calculations 1

• Magnetic Force Calculations 2

• Magnetic Force Applications

• Challenge

At the end of class, we will review how we know the direction of the magnetic field created by a wire or solenoid. Then, we'll learn to quantify the magnetic field with the Law of Biot-Savart. (This law is the magnetic field analog to the superposition integral for electric field E=β«dE .)

Homework: β Positive Physics unit 26 problems due Friday at 10pm. Only completion score counts. No late work will be accepted. QUIZ on Magnetism Review and Biot-Savart on Tuesday, March 1st. Watch the following video on how to use the Biot-Savart Law:

### π₯ 1: F 2/25 lab, π¨ 3: Th 2/24 lab - Biot-Savart problems

Delayed Opening 2/25

1 - 9:10 - 9:55
2 - 10:00 - 10:45
3 - 10:50 - 11:35
L1 - 11:39 - 12:20
5b - 12:25 - 1:10
5a - 11:40 - 12:25
L2 - 12:29 - 1:10
6 - 1:15 - 2:00
7 - 2:05 - 2:50

Check-In: Biot-Savart Current Loop

Today, you'll utilize what you learned from the video last night in order to calculate the magnetic field due to a current-carrying wire. You'll look at problems from section 29-1 of your textbook, apply your problem-solving skills, and collaborate with your classmates to solve difficult problems.

Required: Ch 29 #7, 4, 56, Giancoli Ch 28 #36
Enrichment: Ch 29 #32, 33

Also, pick a couple Biot-Savart problems from the problem section 29-1 at your level of math (if you are in multivariable calculus, you should be working on the 3 dot problems). For Biot-Savart, also review "Current loop" example 28-10 from Giancoli; copy the solution in your notebook.

If there's time remaining, watch the homework videos below.

Homework: Quiz on Magnetism Review and Biot-Savart problems on Tuesday, March 1st. YOU MUST BRING YOUR DISTRICT ISSUED CHROMEBOOK TO THE QUIZ! Watch the following videos on Ampere's Law:

In the first video, lasseviren1 reviews Gauss's Law in order to draw an analogy to Ampere's Law. If you really understand all of the intricacies to Gauss's Law, you'll have a much easier time understanding Ampere's Law.

In this second video, lasseviren1 reviews the same problem he did in the last video, but highlights a couple of details that he rushed through.

### β€οΈ 1: M 2/28, π 3: F 2/25 - Ampere's Law problems (1)

Delayed Opening 2/25

1 - 9:10 - 9:55
2 - 10:00 - 10:45
3 - 10:50 - 11:35
L1 - 11:39 - 12:20
5b - 12:25 - 1:10
5a - 11:40 - 12:25
L2 - 12:29 - 1:10
6 - 1:15 - 2:00
7 - 2:05 - 2:50

Today, we'll start by comparing and contrasting Ampere's Law with Gauss's Law. Then, after watching the homework videos below, we'll work on some Ampere's Law Problems:

Required: Ch 29 # 79, 81, 85, 11, 12, 21, 41, 43, 47, Giancoli Ch 28# 27-28

Homework: Quiz on Magnetism Review and Biot-Savart problems next class - Tuesday, March 1st. YOU MUST BRING YOUR DISTRICT ISSUED CHROMEBOOK TO THE QUIZ! Upload pictures of your textbook solutions to the βοΈ Google Classroom assignment due Tuesday. Make sure you've watched the first two Ampere's Law videos which were in the last post. Then, watch the following videos on examples of the application of Ampere's Law:

The first example is how to find the magnetic field inside a current-carrying wire. Can you find the magnetic field outside the wire? Try this problem and finish the graph that lasseviren1 started - B vs. r.

Check your answer starting at 4:20 of the next video, and then watch the rest of the video which gives an example of finding the magnetic field in a coaxial cable.