Consider the effective potential we considered when studying the radial wave-function of the hydrogen atom: V_eff(r) =rA+r2Bl(l+1) where A and B are real, positive coefficients. (a) At what value of r does the potential vanish? (b) At what value of r is the potential minimized? What is the value of the minimum potential? (c) Plot the effective potential as a function of r for l = 1.