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[" Problem "" A solenoid with an iron co...

[" Problem "" A solenoid with an iron core and a bulb "],[" are connectéd to a d.c.source.How does the brightness "],[" of the bulb change when the iron core is removed from "],[" the solenoid? "],[" Solution.The brightness of the bulb remains unchanged "],[" because the reactancerof inductor is zero in a d.c.circuit."]

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