1. The problem statement, all variables and given/known data An object with a charge of +4.0 x 10^-18 C and a mass of 1.1 x 10^-15 kg is held stationary by balanced gravitational and electric forces midway between horizontal charged plates. What is the applied voltage V? 2. Relevant equations 3. The attempt at a solution I don't really know how to start this question out. Could someone please tell me what it is that I should start out with or find?