1. The problem statement, all variables and given/known data The electric potential a distance r from a point charge q is 195 V, and the magnitude of the electric field is 2870 N/C. Find the values of q and r. 2. Relevant equations 2780q=F Fr=W W/q=195 3. The attempt at a solution Using substitution I got r=.00679 meters, which is correct. I can't substitute to find q... I have no idea what to do.