A parallel plate capacitor of capacitance $C$ is as shown. A thin metal plate A is placed between the plates of the given capacitor in such a way that its edges touch the two plates as shown. Find the capacitance across $P$ and $Q$.

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I think the answer is $0$ as the current literally passes through the capacitor since metal is touching both the plates.

But the answer given is infinity, "because $d$ becomes zero". What does this mean? Why is my answer wrong?

  • $\begingroup$ I think I saw this question in PSE before but I can't find it ... $\endgroup$ – SG8 May 26 at 5:39
  • $\begingroup$ its really bugging me $\endgroup$ – RUP May 26 at 10:43
  • $\begingroup$ Infinite capacitance in parallel with a short is a short. $\endgroup$ – relayman357 May 26 at 12:02
  • 2
    $\begingroup$ This post might be useful. $\endgroup$ – Vincent Thacker May 26 at 13:42

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