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Old 7th October 2008, 11:16 AM   #1
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Default Proximity of dielectric

Does a dielectric need to be touching a conductor to exchange a charge with it? Or just close?

George
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Old 7th October 2008, 01:04 PM   #2
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Pretty sure it doesn't. If you have two parallel plates and insert a dielectric between them, you'll see the capacitance increase.
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Old 7th October 2008, 02:22 PM   #3
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except in a vacuum (as in a vacuum variable capacitor) it's always touching some nitrogen, oxygen, carbon dioxide, a few hydrogen and if you pass gas, some hydrogen sulfide molecules (as well as everything else in the food chain.)
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