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Why an ac solenoid valve attract the plunger even though we interchanges the terminal? Will the poles changes?

 Yes because the poles change for every half-cycle of ac voltage so the polarity of AC voltage is continuously changing for every half cycle. So, the interchanging of terminals in the ac system does not show any difference. That's why the ac solenoid attracts the plunger even though its terminals are interchanged.

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