Khan Academy
Khan Academy: Discovery of Magnetism
Our ancestors noticed that certain rocks were attracted to each other. They also noticed that this force could be transferred onto certain metallic objects. [1:09]
Khan Academy
Khan Academy: Electricity and Magnetism: Magnetism 4
Part 2 of a problem that explores what happens to a proton speeding through a magnetic field.
Khan Academy
Khan Academy: Electricity and Magnetism: Magnetism 12: Induced Current in a Wire
Discover induced current and EMF in a moving wire from a magnetic field. [12:08]
Museum of Science
Eie: The Attraction Is Obvious: Designing Maglev Systems Lesson 1
Watch as a teacher introduces an engineering challenge with the story, Hikaru, where a boy from Japan, learns about transportation engineering as he attempts to design a small Maglev transportation system for his parents' toy store. [14:21]
University of Virginia
Uva Virtual Lab: Electricity and Magnetism Classroom Tour
Take a tour through a typical classroom. What can be found that uses electricity and magnetism? This lab will explore the teacher's computer.
Khan Academy
Khan Academy: Tracing a Magnetic Field
This video demonstrates that a compass will align with the lines of force around a magnet. [0:27]
Khan Academy
Khan Academy: Magnet Near Compass
This demonstration explores the effect of a permanent magnet on compass. [1:04]
Khan Academy
Khan Academy: Increase Strength of Magnet
This video demonstrates how we can increase the strength of a bar magnet using a piece of steel. [0:54]
Khan Academy
Khan Academy: Discovery of Magnetic Fields
Magnetic materials seem to have two sides (poles). Depending on orientation they can be attractive or repulsive. Watch this video for a demonstration. [1:06]
Khan Academy
Khan Academy: Flux and Magnetic Flux
A video introducing the concept of flux and magnetic flux to apply Faraday's law. [10:02]
Khan Academy
Khan Academy: Magnetic Force on a Proton Example (Part 1)
A video reviewing over an example problem to determine the size and direction of the magnetic force on a proton moving through a magnetic field. [10:48]
Khan Academy
Khan Academy: Magnetic Force on a Current Carrying Wire
Find out how the formula F=ILB is derived in this video. Also, learn how to use the formula to calculate the force on a current carrying wire.
Khan Academy
Khan Academy: Induced Current in a Wire
A video that shows how to determine the current and EMF induced in a wire pulled through a magnetic field. [12:08]
Khan Academy
Khan Academy: Compass Interactions
A short video doing a short experiment to see ff we float two identically magnetized needles they will always orient themselves in the same way. [0:45]
Khan Academy
Khan Academy: Magnetic Force Between Two Currents Going in the Same Direction
Sal Khan shows how to determine the magnetic force between two currents going in the same direction. [10:59]
Khan Academy
Khan Academy: Inverse Square Law (Deflection Method)
An experiment to try to measure the change in the force of a magnet over a distance using the deflection of a compass. What is wrong with this approach?
Khan Academy
Khan Academy: Discovery of Magnetism: Compass Build (Stroke Direction)
An experiment that asks, does the direction that we stroke the needle determine the final orientation of a compass? [1:15]
Khan Academy
Khan Academy: Inverse Square Law (Method of Oscillation)
Here we compare the speed of compass oscillation vs. distance from a magnet. What kind of relationship do we observe? Is it linear? [2:08]
Khan Academy
Khan Academy: Are Two Magnets Stronger Than One?
A brief experiment that looks at whether the power of two magnets stuck together will increase the overall force.
Khan Academy
Khan Academy: Discovery of Magnetism: Compass Build (Magnet Orientation)
When making a compass, does it matter if we stroke the needle with the North vs. South pole of the magnet? Why? [1:07]
Khan Academy
Khan Academy: Discovery of Magnetic Fields: Magnetic Permeability
What happens to the magnetic field of a magnet in the presence of another material which is attracted to it? Why does this happen? [2:03]
Khan Academy
Khan Academy: Neutralize a Compass
This video demonstrates how to neutralize a compass using two needles. How could this help us later? Why does this work? [:46]
Khan Academy
Khan Academy: Discovery of Magnetism
Our ancestors noticed that certain rocks were attracted to each other. They also noticed that this force could be transferred onto certain metallic objects! This video is a quick demonstration of this discovery. [1:08]
Khan Academy
Khan Academy: Compass: Which Way Is North?
This video demonstrates the process of making a compass: How would you know which way is north if you had no reference? Can the direction of stroke alone tell you this? Are you sure? [1:00]