How many will succeed?

Electrically charged drops of mercury fall from an altitude \(h\) into a spherical metal vessel of radius \(R\) in the upper part of which there is a small opening. The mass of each drop is \(m\) and the charge of the drop is \(q\). The number \(n\) of the last drop that can still enter the sphere is \(\large n*2\pi \epsilon_0 \frac{mg(h-R)R}{q^2}\). Then what is the value of \(n\)?

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