A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightnessof the bulb decreases when -(1) frequency of the AC source is decreased(2) number of turns in the coil is reduced(3) a capacitance of reactance X = X, is included in the same circuit(4) an iron rod is inserted in the coil

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A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when -

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter15: Alternating-current Circuits

Section: Chapter Questions

Problem 62CP: A 1.5k resistor and 30-mH inductor are connected in series, as below, across a120-V(rms)ac power...

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Question

A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness
of the bulb decreases when -
(1) frequency of the AC source is decreased
(2) number of turns in the coil is reduced
(3) a capacitance of reactance X = X, is included in the same circuit
(4) an iron rod is inserted in the coil

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