Answer :

Concepts/Formulas Used:

Time constant for capacitor:

Where R is the resistance through which the capacitor is being charged/discharged and C is the capacitance.

Capacitance of a parallel plate capacitor:

A capacitor consists of two conducting plates of area of cross section A each separated by a distance d. The capacitance if there is only vacuum between the plates is given by:

where ϵ0 is the permittivity of free space.


Area of the plate,


Now, distance of separation:

Resistance ,

We know that,

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