MIT Physics Demo -- Galvanometer Principle

Two large coils of wire ("Helmoholz coils") are connected to 125V DC power, and produce a uniform magnetic field between the coils. A separate coil is suspended with this field. Switching the polarity of the DC current in the inner coil causes it to rotate in opposite directions.

This principle is used by devices called galvanometers to measure electric current.

See original video on MIT TechTV -http://techtv.mit.edu/videos/812

Category:

Education

Tags:

• mittechtv
• physics
• mit
• demo
• demonstration
• magnet
• electromagnetism
• electricy
• coil
• wire
• introductory
• faraday
• ampere
• current

[FisicaCiencia]

:omgomgomg:

[donny0man]

@KiranaForever This is meant to be supplementary material to the text. These demonstrations are very commonly used in lectures, while the lecturer explains whats going on. I imagine these videos are used for people taking the courses online, or by correspondence when they can't see these demos in person.

[nRADRUS]

why u do not show main element of construction - string !

[OpenComments]

@captkirkconnell

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[93MrSahil]

thank you for the video

[captkirkconnell]

MIT using internet in a wise way, giving me a wise way to use my computer and net.

Thanks!

[garyremindable101]

@JkAc9597 thanks for the science lesson.

[JkAc9597]

@garyremindable101 When the larger blue coils have an electric current running through them, they create a magnetic field. The same happens to the smaller red coil. The movement is created by the two magnetic fields interacting with each other.

[garyremindable101]

i don get it...

[heberzunarelli]

Cool and very simple. Thanks!