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What causes a pithball to move in an experiment involving a pithball electroscope?
Wiki User
∙ 15y ago
electrons jump onto or off the neutral ball when a charged object comes close to it
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoelectrons jump onto or off the neutral ball when a charge object comes close to it,causing it to become charged.
Wiki User
∙ 15y agoElectrical fields, analogous to magnetic fields around magnets.
Anonymous
An electrical charge.
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In experiments involving a pinball electroscope what causes the pithball to move?
An electroscope is a device that detects and measures electricity. In experiments involving a pinball electroscope, the pith ball moves because of an induced charge.
What is a pithball?
It is a very light, nonconducting, substance that is used to demonstrate electrostatic forces. Typically a small amount is hung at the end of a string. When a charged rod is brought close to the pithball it polarizes the pithball molecules. That is, it attracts charges that are opposite the charged rod and repels the like charges. This causes the molecules in the pithball (which has zero net charge) to slightly rotate so the unlike charges are nearer the surface and closer to the rod. When this happens, there is a net attractive electric force on the pithball which causes it to swing (slightly) toward the rod. If the pithball touches the rod it will pick up some charge from the rod. All of a sudden it now has a net charge, which is the same sign as the rod's charges and the pithball will swing (strongly) away from the rod because like charges repel. The pithball was originally made from dried pith, a soft spongy material found in the stems of plants. Nowdays, lots of materials will work; dried corn cob, styrofoam etc. The requirement is that it be lightweight (so it will easily swing when subjected to the electric forces described above).
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