Slow Motion Magnetic Fields!

https://www.youtube.com/watch?v=75wrs0PLl_s

Pre-lecture Study Resources

Watch the pre-lecture videos and read through the OpenStax text before doing the pre-lecture homework or attending class.

BoxSand Videos

Learning Objectives

Summary

Summary

Atomistic Goals

Students will be able to...

  1.  

BoxSand Introduction

Magnetic Effects  | Magnetic Fields

 

 

 

Key Equations and Infographics

A representation with the words biot-svart law magnitude of magnetic field: moving charge on the top. There is an equation that shows that the magnitude of the magnetic field is equal to the vacuum permeability divided by four pi multiplied by the magnitude of the charge times the product of the speed of the charge and sine of the smallest angle between the velocity and the change in position, divided by the square of the displacement vector pointing from the charge to the location of interest. This is also written in words below.

 

A representation with the words magnitude of a magnetic field: infinite straight wire on the top. There is an equation that shows that the magnitude of a magnetic field produced by infinite straight wire is equal to the permeability of free space multiplied by the current divided by two pi times the distance away from the wire. This is also written in words below.

 

A representation with the words magnitude of a magnetic field: current loop on the top. There is an equation that shows that the magnitude of a magnetic field produced by a current loop is equal to the permeability of free space multiplied by the number of loops and current divided by the twice the radius of loops. This is written in words below.

Now, take a look at the pre-lecture reading and videos below.

OpenStax Reading


OpenStax Section 22.1  |  Magnets

Openstax College Textbook Icon

OpenStax Section 22.2  |  Ferromagnets and Electromagnets

Openstax College Textbook Icon

OpenStax Section 22.3  |  Magnetic Fields and Magnetic Field Lines

Openstax College Textbook Icon

OpenStax Section 22.9  |  Magnetic Fields Produced by Currents: Ampere’s Law

Openstax College Textbook Icon

 

Equations, definitions, and notation icon Concept Map Icon
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Additional Study Resources

Use the supplemental resources below to support your post-lecture study.

YouTube Videos

Pre-Med Academy's video series on magnetism. The first discusses the phenomena that is magnetism, the second talks about magnetic fields

Pre-Med Academy: Magnetism - Phenomena

Pre-Med Academy: Magnetism - Magnetic Fields

 

Other Resources

This link will take you to the repository of other content related resources for impulse.

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Simulations


 

Phet interactive with amgnets and the amgnetic field. Explore the interactions between a compass and bar magnet. Discover how you can use a battery and wire to make a magnet! Can you make it a stronger magnet? Can you make the magnetic field reverse? Can you predict the direction of the magnetic field based on the placement of the magnet?

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For additional simulations on this subject, visit the simulations repository.

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Demos


For additional demos involving this subject, visit the demo repository

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History


Oh no, we haven't been able to write up a history overview for this topic. If you'd like to contribute, contact the director of BoxSand, KC Walsh (walshke@oregonstate.edu).

Physics Fun

How the Earth creates a magnetic field

https://www.youtube.com/watch?v=lWHxmJf6U3M

Other Resources


Resource Repository

 

Boundless online text has two sections, Magnetism and Magnetic Fields, and Ferromagnets and Electromagnets.

Magnetism and Magnetic Fields Ferromagnetics and Electromagnets
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PPLATO is a complete resource with a lot of information, and several practice questions per subject. This webpage covers Magnets and Magnetic Fields. 

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Here's a link to Hyperphysics' reference for magnetic fields

Hyper Physics Icon

Boston University text page for magnetism.

B.U. Physics Icon

Isaac Physics' section on the magnetic field

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Other Resources

This link will take you to the repository of other content related resources for impulse.

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Problem Solving Guide

Use the Tips and Tricks below to support your post-lecture study.

Assumptions

 

Checklist

 

Misconceptions & Mistakes

 

Pro Tips

 

Multiple Representations

Multiple Representations is the concept that a physical phenomena can be expressed in different ways.

Physical

Physical Representations describes the physical phenomena of the situation in a visual way.

 

Mathematical

Mathematical Representation uses equation(s) to describe and analyze the situation.

A representation with the words biot-svart law magnitude of magnetic field: moving charge on the top. There is an equation that shows that the magnitude of the magnetic field is equal to the vacuum permeability divided by four pi multiplied by the magnitude of the charge times the product of the speed of the charge and sine of the smallest angle between the velocity and the change in position, divided by the square of the displacement vector pointing from the charge to the location of interest. This is also written in words below.

 

A representation with the words magnitude of a magnetic field: infinite straight wire on the top. There is an equation that shows that the magnitude of a magnetic field produced by infinite straight wire is equal to the permeability of free space multiplied by the current divided by two pi times the distance away from the wire. This is also written in words below.

 

A representation with the words magnitude of a magnetic field: current loop on the top. There is an equation that shows that the magnitude of a magnetic field produced by a current loop is equal to the permeability of free space multiplied by the number of loops and current divided by the twice the radius of loops. This is written in words below.

Graphical

Graphical Representation describes the situation through use of plots and graphs.

 

Descriptive

Descriptive Representation describes the physical phenomena with words and annotations.

 

Experimental

Experimental Representation examines a physical phenomena through observations and data measurement.

 

Practice

Use the practice problem sets below to strengthen your knowledge of this topic.

Fundamental examples

(1) The wire in the diagram below has a magnitude $I = 10 mA$. What is the magnitude and direction of the magnetic field from this current-carrying wire at point P on the diagram?

This is an image of a rod with a current moving from left to right. There is an axis where the x axis is along the rod and from the origin there is some point p with a y position of three centimeters.

(2) A loop of wire with radius $r = 5 cm$ carries a current with magnitude $I  = 100 nA$, traveling in the counter-clockwise direction as viewed from above. What is the magnitude and direction of the magnetic field at the center of the loop?

(3) In the diagram below, the vertical wire carries a current of magnitude $I_1 = 4 A$ in the positive y-direction and the horizontal wire carries a current of magnitude $I_2 = 2 A$ in the negative x-direction. What is the magnitude of the magnetic field at point P?

 

This is an image of two rods where rod one is moving along the y axis and the rod two is moving along the x axis. The point p is at some location in the upper right from the intersection where it is ten centimeters from the vertical rod and 10 centimeters from the horizontal axis.

Solutions found here: 1(direction should be out of page!), 2, 3

 

Short foundation building questions, often used as clicker questions, can be found in the clicker questions repository for this subject.

Clicker Questions Icon

 

Practice Problems

BoxSand practice problems

BoxSand's conceptual problems

BoxSand's multiple select problems

BoxSand's quantitative problems

Recommended example practice problems 

  • Openstax has practice problems toward the end of each section,
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For additional practice problems and worked examples, visit the link below. If you've found example problems that you've used please help us out and submit them to the student contributed content section.

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