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I charged a 100nF capacitor with 12V with a battery, then i disconnect the battery from the capacitor and connect the positive side of the capacitor to ground (which is an electron source) theoretically this plate should be made neutral in such a way that the unconnected plate ( the negative) has a net charge, to check if it actually had a net charge on the capacitor I did the same procedure with another capacitor and brought them closer together, theoretically they should repel each other but nothing happens.

I tried to use ceramic and electrolytic capacitors of different values but it doesn't work, why?

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  • $\begingroup$ Only connecting 1 side does not complete a circuit. $\endgroup$
    – Adrian Howard
    Commented Jun 13, 2021 at 23:16
  • $\begingroup$ The force between small objects charged to 12V is extremely small. en.wikipedia.org/wiki/Electroscope $\endgroup$
    – Keith McClary
    Commented Jun 14, 2021 at 0:04
  • $\begingroup$ The globe on a Van de Graaff generator is a single plate of a capacitor. $\endgroup$
    – Keith McClary
    Commented Jun 14, 2021 at 0:47
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    $\begingroup$ Unlike charges attract. The positive and negative charges on the capacitor attract each other until you connect both plates of the capacitor together in a circuit. $\endgroup$
    – David White
    Commented Jun 14, 2021 at 2:30
  • $\begingroup$ It would help if you indicate your background. Do you know that the surface charge density on a conductor is proportional to the electric field intensity? $\endgroup$
    – Keith McClary
    Commented Jun 14, 2021 at 3:35

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