A solenoid having a cross section of 5 cm2 is shown in Figure P13.42.
a. Calculate the force exerted on the plunger when the distance x is 2 cm and the current in the coil (where N = 100 turns) is 5 A. Assume that the fringing and leakage effects are negligible. The relative permeabilities of the magnetic material and the nonmagnetic sleeve are 2,000 and 1.
b. Develop a set of differential equations governing the behavior of the solenoid.
Figure P13.42
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