(i) When the number of turns in the inductor is reduced, its reactance XL decreases. The current in the circuit increases andhence brightness of the bulb increases.
(ii) When an iron rod is inserted in the inductor, the self-inductance increases. Consequently, the inductive reactance XL = ωL increases. This decreases the current in the circuit and the bulb glows dimmer.
(iii) With capacitor of reactance XC=XL, the impedance becomes minimum, the current in circuit becomes maximum. Hence the bulb glows with maximum brightness.
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