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Videos By Chapter
from
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
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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.

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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.

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Interactions Between Electricity and Magnetism

Discussion
Streaming
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Cathode Ray Tube
A stream of electrons will be bent by a magnetic field.

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Magnetic Force on Current Carrying Wire
A current carrying wire will experience a force due to a magnetic field.

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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).

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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.

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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.

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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.

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Light Bulb in Mag Field
Because an incandescent light bulb works on AC, the filament will vibrate in the presence of a magnetic field.

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Principles of Electromagnetism

Discussion
Streaming
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Demo Page
Attracting Coils
Two coils can be wired so that their magnetic field attract each other when the current is turned on.

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Repelling Coils
Two coils can be wired so that their magnetic field oppose each other when the current is turned on.

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Electric Motor
Repelling magnetic fields cause this motor to turn.

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Faraday's Law
A changing magnetic field will induced a changing current in the coil.

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Induction Motor
Eddy currents set up in a floating metal ball repel the magnetic field from the apparatus and make the ball spin.

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Oersted's Effect
A current carrying wire will have a magnetic field directed by the right hand rule.

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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.

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