1. The problem statement, all variables and given/known data A single proton and a single electron are fixed at a distance of 2.8 meters from each other. Find the magnitude of the electric force of attraction between them. i have the answer to this, it is: 2.93*10^-29 but now it asks: Find the magnitude of the gravitational force of attraction between the proton and the electron. (Mass of a proton = 1.67 x 10-27 kg; Mass of an electron = 9.11 x 10-31 kg) i'm not sure where to put gravity, 6.67 * 10^-11, in the equation: F=k*Q*q/r2 thank you!