Determine the electromagnetic force on the plunger, Electrical Engineering

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Q. Consider the electromagnetic plunger shown in Figure. The λ-i relationship for the normal working range is experimentally found to be λ = Ki 2/3 /(x+t), where K is a constant. Determine the electromagnetic force on the plunger by the application of Equations. Interpret the significance of the sign that you obtain in the force expression.

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