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Assertion : A glowing bulb becomes dim when an iron bar is put in the inductor in the a.c. circuit Reason : Resistance of the circuit increases.A. AB. BC. CD. D |
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Answer» Correct Answer - A On introducing an iron bar in the inductor, inductive reactance `X_(L) = oemga L` increases. Therefore impedance of the circuit `Z = sqrt(R^(2) + (X_(L) - X_(C ))^(2))` , increases, current through the bulb decreases and it becomes dim. |
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