D2. Amber and Glass Rods with Helium Filled Balloons

ELECTROSTATICS - Electric Charge

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A negatively-charged amber rod is brought close to an uncharged conducting balloon. The balloon is attracted by the rod, touches it, becomes negatively charged, and is quickly repelled by the rod. A positively-charged glass rod attracts the balloon. The same sequence is repeated with an uncharged, non-conducting balloon. This time, the balloon sticks to the amber rod after touching it.

Location: Room 4-309B, B5