A Thin Metal Plate
A thin metal plate is inserted between the plates of a parallel-plate capacitor of capacitance in such a way that its edges touch the plates as shown.
The capacitance now becomes:
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1 solution
C = V Q is a known relationship for capacitance.
C becomes infinite/indeterminate as the potential difference between the plates becomes zero. In other words, the capacitor is short circuited. The thin metal plate P has been inserted in a manner that would short circuit the capacitor.