Question

what is the function of second plate in a parallel plate capacitor

Answer 1

A parallel plate capacitor consists of two large plane parallel conducting metal plates separated by a small distance.
The second plate acts as a neighbouring conductor due to which the potential of first plate is reduced, keeping its size same ;due to which the capacitance increases.

Answer 2

Answer:

A parallel plate capacitor consists of two large plane parallel conducting metal plates separated by a small distance. The second plate acts as a neighbouring conductor due to which the potential of first plate is reduced, keeping its size same ;due to which the capacitance increases.