Massachusetts Institute of Technology
Sign in Create Account

Rubber and Glass Rods with Tinsel and Balloon

A plexiglass rod rubbed with fur picks up a positive electric charge, while a rubber rod rubbed with fur picks up a negative electric charge. When either rod is brought in contact with hanging tinsel, the tinsel becomes charged and flares out. The other rod, however, will now attract the tinsel. Touching the tinsel with your hand discharges it.

These electrostatic forces can also be seen with a conducting balloon. Touching a charged rod to the balloon transfers charge, causing the balloon to be repelled away from the rod.

The ancient Greeks noticed this phenomenon when rubbing pieces of amber (which pick up a negative electric charge, like our rubber rod). The word "electricity" is based on the Greek name for amber: "elektron."

Comments (0)

It looks like no one has posted a comment yet. You can be the first!

You need to log in, in order to post comments. If you don’t have an account yet, sign up now!

MIT Department of Physics Technical Services Group

MIT Department of Physics Technical Services Group

Category: Science | Updated almost 2 years ago

Created
January 06, 2009 13:23
Category
Tags
License
Creative Commons Attribution-NonCommercial (What is this?)
Additional Files


Viewed
38986 times

More from MIT Department of Physics Technical Services Group

MIT Physics Demo -- Centrifugal versus Centripetal Motion

MIT Physics Demo -- Centrifugal ver...

Added over 6 years ago | 00:01:18 | 33777 views

Two Dimensional Collisions

Two Dimensional Collisions

Added almost 6 years ago | 00:01:19 | 45288 views

Fire Extinguisher on a Tricycle

Fire Extinguisher on a Tricycle

Added over 6 years ago | 00:00:53 | 37585 views

Sound Wave Interference

Sound Wave Interference

Added over 3 years ago | 00:02:14 | 10328 views

Center of Mass Trajectory

Center of Mass Trajectory

Added almost 6 years ago | 00:01:30 | 49298 views

Coupled Air Carts

Coupled Air Carts

Added almost 6 years ago | 00:07:38 | 49683 views