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## Homework Statement

A point particle of mass m and charge q(>0) approaches to a point particle Q(>0) at a fixed position. When the distance between the two particles is L, the speed of the moving particle is v. The permittivity of the vacuum is denoted as Epsilon0. Find the minimum distance between the two particles?

## Homework Equations

## The Attempt at a Solution

What i get is, the Q will repel q at the shortest distance q will ever able to reach. Because of the Force between them. So

I used

Vfinal ^2 = Vinitial ^2 -2as

S is the question

a is force/m

Force is kQq/r^2

I know i am wrong.

I don't know what epsilon for..

Please help me..