An inductor is made up of a 525-turn coil on

An inductor is made up of a 525-turn coil on

An inductor is made up of a 525-turn coil on a core of 14-cm2 cross-sectional area and gap length 0.16 mm. The coil is connected directly to a 120-V 60-Hz voltage source. Neglect the coil resistance and leakage inductance. Assuming the coil reluctance to be negligible, calculate the time-averaged force acting on the core tending to close the air gap. How would this force vary if the air-gap length were doubled?

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