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Inquiries Into Physics

Chapter 8: E & M

1. Magnetism
2. Interactions between Electricity and Magnetism
3. Principles of Electromagnetism
4. Applications of Sound Production
5. Electromagnetic Waves
6. Blackbody Radiation
7. EM Waves and the Earth's Atmosphere

Electromagnetic Videos

Magnetism	Discussion	Streaming	Download	Demo Page
Magnaprobe (3D compass): How it works	A 3D compass always aligns itself to the magnetic field it is in, such as the Earth's magnetic field. Watch how the needle maintains its position even though the handle is turned.	Real	Real MPG	E and M 5H10.12
Magnaprobe (3D compass): Magnetic Field Lines	A 3D compass always aligns itself to the magnetic field it is in, such as the Earth's magnetic field. Watch how the needle maintains its position even though the handle is turned.	Real	Real MPG	E and M 5H10.12
Interactions Between Electricity and Magnetism	Discussion	Streaming	Download	Demo Page
Cathode Ray Tube	A stream of electrons will be bent by a magnetic field.	Real	Real MPG	E and M 5H30.10
Magnetic Force on Current Carrying Wire	A current carrying wire will experience a force due to a magnetic field.	Real	Real MPG	E and M 5H40.30
Florescent Bulb in Mag Field	The high magnetic field sets up a corresponding electric field in the bulb, exciting the gas therein and lighting the bulb (light saber).	Real	Real MPG	E and M 5N20.50
Jumping Ring; cold ring, regular core	The magnetic field induced in the ring opposes the magnetic field of the core, making it jump off the apparatus. Cooling the ring before hand in LN2 lowers its resistance and allows it to jump higher.	Real	Real MPG	E and M 5K20.30
Jumping Ring; cold ring, long core	The magnetic field induced in the ring opposes the magnetic field of the core, making it hover above the apparatus. Cooling the ring before hand in LN2 lowers its resistance and allows it to hover higher.	Real	Real MPG	E and M 5K20.30
Jumping Ring; split ring, regular core	A magnetic field cannot be induced in the ring when the ring is split, such as seen here using an aluminum Pepsi can.	Real	Real MPG	E and M 5K20.30
Light Bulb in Mag Field	Because an incandescent light bulb works on AC, the filament will vibrate in the presence of a magnetic field.	Real	Real MPG	E and M 5H40.23
Principles of Electromagnetism	Discussion	Streaming	Download	Demo Page
Attracting Coils	Two coils can be wired so that their magnetic field attract each other when the current is turned on.	Real	Real MPG	E and M 5H40.15
Repelling Coils	Two coils can be wired so that their magnetic field oppose each other when the current is turned on.	Real	Real MPG	E and M 5H40.15
Electric Motor	Repelling magnetic fields cause this motor to turn.	Real	Real MPG	E and M 5K40.40
Faraday's Law	A changing magnetic field will induced a changing current in the coil.	Real	Real MPG	E and M 5K10.20
Induction Motor	Eddy currents set up in a floating metal ball repel the magnetic field from the apparatus and make the ball spin.	Real	Real MPG	E and M 5H20.50
Oersted's Effect	A current carrying wire will have a magnetic field directed by the right hand rule.	Real	Real MPG	E and M 5H10.20
Transformer	An AC current can not only be transmitted from one coil to another without wires, but due to the ratio of the coils, the voltage can be stepped up or down. An iron core is used to boost the coils' current in the demo.	Real	Real MPG	E and M 5K30.61