THE 5-SECOND TRICK FOR FIIDO Q1

Think about the Specific situation of a positive point cost q in the origin. To work out the probable attributable to q at a length r from your origin relative to some reference of 0 at infinity (remember that we did the identical for possible Strength), let (P = r) and (R = infty), with (dvec l = dvec r = hat r dr) and use (vec E = frac kq r^two h