SX500 NO FURTHER A MYSTERY

Look at the Specific circumstance of the optimistic level demand q for the origin. To estimate the probable due to q in a distance r through the origin relative to some reference of 0 at infinity (recall that we did a similar for potential energy), Permit (P = r) and (R = infty), with (dvec l = dvec r = hat r dr) and use (vec E = frac kq r^two hat