This is a very interesting demonstration by the MIT physics department. This gives major clues to the actual workings of capacitance.
make sure you watch the entire way through, the first half is nothing special.
YouTube - MIT Physics Demo -- Dissectible Capacitor
make sure you watch the entire way through, the first half is nothing special.
YouTube - MIT Physics Demo -- Dissectible Capacitor
Next we have a three-piece dissectible Leyden Jar consisting of two metal cups separated by a glass cup. When charged with the Wimshurst machine, we see by touching it with the shorting rod that it holds a large amount of charge. However, when disassembled, the metal cups can be brought into contact with each other and no spark will be generated. When the jar is reassembled it can then be discharged. This demonstrates that, in this situation, the charge actually resides on the surface of the glass (a dielectric), not on the metal.
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