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  4. One of the plates of the capacitor is connected to a source at +20 V. The other plate P is earthed. What is the potential of the plate P ?

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Q. One of the plates of the capacitor is connected to a source at $+20\, V$. The other plate $P$ is earthed. What is the potential of the plate $P$ ?

Electrostatic Potential and Capacitance

Solution:

When a plate is earthed its potential is zero.
When a plate is not earthed and it is not connected to a source of emf even in this case also its potential is zero