A light rod of length \(L\) is attached to a frictionless pivot at one end. A small object of mass \(M\) is fixed to the rod at a distance \(d\) from the pivot, where \(d < L\). A constant force of magnitude \(F\) is applied to the free end of the rod, and the force is always maintained in a direction perpendicular to the rod. The rod and object are initially at rest. What is the magnitude of the angular acceleration \(\alpha\) of the rod-object system immediately after the force is applied?