شق Figure 2.3 N x IM xo کرو D Electromechanical system in problem 3/nProblem 3 (Textbook 2.8) Consider Fig. 2.3 where the externally applied mechanical force f is changed. The source

voltage v is constant and the leakage inductance L, and the external inductance I are both zero. As f is changed, er changes. (a) Find an expression for i in terms of v,r, and ef. (b) Show that the energy dissipated in the resistor may be expressed as 2v = 7/7 dt - ²0e,dt + 7 e²dt Wel = (c) Express Wg (the total electrical energy) and We (the electrical energy delivered to the coupling field) in a similar manner.