How Does Capacitor Separation Affect Its Half-Life in a Circuit?

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Homework Statement

If I have a circuit in which the capacitor is the large disk device and for each value of separation=d, calculate the half-life of exponential decay?

Homework Equations

The Attempt at a Solution

What is the formula to do this?

 

[rl.bhat]

Formula for exponential decay is Q = Qo*e^-t/RC
At half life Q = Qo/2.Substitute this value in the above expression. Take the logarithm and substitute C = epsilon(not)*A/d.Then write down the expression for T1/2.