Small identical balls with equal charges are fixed at vertices of regular 2004–gon with side a. At a certain instant, one of the balls is released and a sufficiently long time interval later, the ball adjacent to the first released ball is freed. The kinetic energies of the released balls are found to differ by K at a sufficiently long distance from the polygon. The charge q of each part is  $\sqrt{x\pi {\epsilon }_{0}aK}$. Find x?