10.10. The gravitational potential at any point P due to two masses M, and M2 is given by (see Fig. P10.10) GM, GM2 V(r) : 72 Suppose M, = nM2, where n = 2 or 3. Outline a method for drawing equipotential lines, and draw them for these two cases. %3D M, M: Figure P10.10 10.11. In Problem 10.10, if the masses are not point masses but are spheres of finite sizes, what changes will take place in the equipotential lines? 10.12. Draw lines of force and cequipotential lines due to two masses M, and M, when (a) M, = M2, and (b) M, > M,. %3D