Van De Graaff Generator Question.

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Ava

10 januari 2017 19:55

Something I didn't understand about van de graaff generators.

I was reading about an experiment in which objects (neutral, I believe) are attracted to the generator a few seconds after it is switched on. Apparently, after they touch the generator, they then move away.

I believe I understand why the neutral objects are attracted to the generator; the charged generator repels the same type of charges to itself from the surface of the objects, leaving only the opposite charge at the surface, and therefore inducing a temporary attraction.

However, why do the objects then fall away? Is it to do with the charges dissipating when they touch another object ie. the generator is earthed? Or does the charge from the generator flow into the objects, giving them the same charge and so repelling them? I presume its the latter, but I would like to be sure.

Thanks in advance.

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trent.heaver1

1 juli 2019 08:26
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As electrons are drawn out of the object by the positive dome of the Van De Graff generator, these electrons are taken away by the generators belt, meaning that the dome remains positive. This results in the Van De Graff and the object having the same positive charge, causing them to be repelled.

If we had a stack of plates on the top of a Van De Graff generator then the bowls will take the positive change and repel the positive charge on the dome – hence being repelled from the dome.

I realise now that this question was asked two year ago but hopefully this response can still help somebody :)

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Van De Graaff Generator Question.

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