Determine the force F between the faces of the poles (stationary coil and plunger) of the solenoid pictured in Figure P18.38 when it is energized. When energized, the plunger is drawn into the coil and comes to rest with only a negligible air gap separating the two. The flux density in the cast steel pathway is 1.1 T. The diameter of the plunger is 10 mm. Assume that the reluctance of the steel is negligible.
Analysis:
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