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Showing posts 1 - 3 of 63. View more »

How well do you understand magnetism?

posted Feb 17, 2020, 1:13 PM by Barbara Fortunato   [ updated Feb 17, 2020, 1:15 PM ]

1: T 2/25, 3: T 2/25

Exam on Magnetism TODAY!

Homework:  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.):

How do we calculate magnetic flux? How do we utilize Faraday's Law to find the current in a loop of wire?

posted Feb 17, 2020, 12:59 PM by Barbara Fortunato

 1: M 2/24, 3: F 2/21Daily quiz: Lenz/FaradayToday, after your daily quiz (could be Lenz's Law or Faraday's Law or both), 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, 28Homework:  Study for Exam next class on magnetism - Tuesday, February 25th.

What causes a current to be induced?

posted Feb 17, 2020, 6:24 AM by Barbara Fortunato

1: F 2/21 lab, 3: Th 2/20 lab

Today, we will start a guided inquiry project to study variables that cause induction.

1.  Open the Faraday's Electromagnet Lab 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.

2.  Using this information, experimentally create a wire configuration with 1 meter of wire that induces the most current.  Collect data, make observations, and improve your design as necessary until you feel that you have created an optimal design.

Homework:  Watch the following video on Faraday's Law of electromagnetic induction.  Only the first 20 minutes are required.  The rest is up to you.  You may be asked to do similar things to the last 7 minutes on the exam, so you should either watch it, flip though it to get the main idea, or watch it later before your test.

Also finish your Induction presentations. They should be no more than 10-15 minutes, and can be a lot shorter if you want. You must talk about your observations from the applet and then talk about how you used these observations to design your current generator. Finally, give evidence of your results.

How did JJ Thomson find the charge-to-mass ratio for an electron?

posted Feb 17, 2020, 6:05 AM by Barbara Fortunato   [ updated Feb 19, 2020, 4:30 AM ]

1: W 2/19, 3: W 2/19

Today, as our daily quiz, we'll do some practice with a mass spectrometer.

Then, we'll use a cathode ray tube to repeat the experiment of J.J. Thomson to find the charge-to-mass ratio.  In doing so we'll review how a charged particle behaves in an electric and a magnetic field.  For the next class, write in your journals the derivation of the magnetic field from a coil and your calculated value for q/m.  List at least 5 sources of possible error.  Your calculated value should be within an order of magnitude of the accepted value.  SIMULATION.

To get a visualization of the magnetic field between Helmholtz coils, check out this video, where you can see that in the center region, the magnetic field is fairly uniform.

Helmholtz Coil - B field visualization

HomeworkStudy for Exam on magnetism will be Tuesday, February 25th.

How do you solve more problems with Ampere's Law?

posted Feb 8, 2020, 12:06 PM by Barbara Fortunato   [ updated Feb 17, 2020, 5:38 AM ]

 1: T 2/18, 3: Th 2/13Today, after a daily quiz, we'll finish the required AP problems and do some AP multiple choice.      Required: 1983E3, 1988E3a, multiple choiceThen, we'll do some Biot-Savart and Ampere's Law problems from the textbook:     Required: UPDATED TO HALLIDAY Ch 29 #35, 49, 52, 53, 54, 81, and 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)Homework:  Finish all problems from previous posts.  If you have any questions, write them down.  Exam on magnetism will be Tuesday, February 25th.

How do we solve problems using Ampere's Law? How can we find an expression for the magnetic field inside and outside of a slinky?

posted Feb 8, 2020, 11:48 AM by Barbara Fortunato   [ updated Feb 10, 2020, 7:30 AM ]

1: Th 2/13 lab, 3: W 2/12 lab

Daily Quiz: Ampere's Law 2

Today, start by finishing any problems that you didn't finish from the textbook.  Then, we'll use what we've learned about Ampere's Law to finish some AP problems assigned last class.
Required:  2000E31993E11979E2

Then in the second half of lab, in lab groups you'll run current through a slinky and qualitatively try to figure out which variables affect the magnetic field.  As a class we will use your observations to determine the equation for the magnetic field inside of a slinky.

With any time remaining, you'll have a choice. You can catch up on videos that you haven't watched, you can find more AP problems online, you can do more problems from the textbook on Biot-Savart, or you can work ahead.

Homework:  Watch the following video on finding the magnetic field inside a solenoid and toroid.  I'm sorry this video is so much longer than normal (31 minutes), but my hope is that we talk about a lot of this stuff in class, especially when it comes to the solenoid.  Definitely watch the last part about the toroid:

How do you solve problems with Ampere's Law?

posted Feb 8, 2020, 11:46 AM by Barbara Fortunato   [ updated Feb 10, 2020, 7:30 AM ]

1: T 2/11, 3: T 2/11

Daily Quiz: Ampere's Law 1

Today, start by looking over circuits assessments and completing an online metacognitive reflection.

Then, we'll continue class by finishing any problems that you didn't finish from the textbook.  Finally, we'll use what we've learned about Ampere's Law to solve some AP problems.
Required:  2000E31993E11979E2

Homework:  Watch the following video showing two more examples of Ampere's Law.  After you watch both examples, finish the second example by finding the magnetic field as a function of r outside of the wire and finish the B vs. r graph.

How can you solve Ampere's Law problems?

posted Feb 5, 2020, 5:22 AM by Barbara Fortunato   [ updated Feb 5, 2020, 9:36 AM ]

1: M 2/10, 3: F 2/7

Daily quiz: Biot-Savart

Today, 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

With any time remaining, work on AP Problems from the next post.

Homework:  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.

Ampere's Law: B inside a current-carrying wire (lasseviren1)

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.

How do you apply the Law of Biot-Savart?

posted Feb 5, 2020, 5:18 AM by Barbara Fortunato   [ updated Feb 7, 2020, 6:21 AM ]

1: F 2/7 lab, 3: Th 2/6 lab

We'll start the period by testing our understanding of force on moving charged particles in magnetic fields with a couple of demonstrations. We'll discuss applications including the mass spectrometer.

Following the demonstrations, I will introduced the Law of Biot-Savart.  Then watch the following video on how to use the Biot-Savart Law:

Biot-Savart Law

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

Homework:  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.

Ampere's Law part 1 (lasseviren1)

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.

How well do you understand circuits with resistors and capacitors?

posted Feb 5, 2020, 5:12 AM by Barbara Fortunato   [ updated Feb 5, 2020, 7:44 AM ]

 1: W 2/5, 3: W 2/5 EXAM Today on Circuits! Homework:  Finish problems from AP problems for force by magnetic field.   (MC ans: CADEEACDA)

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