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

frequency of the AC source is decreases

number of turns in the coil is reduced

a capacitance of reactance X_c=X_L is included in the same circuit

an iron is inserted in the coil

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Solution

an iron is inserted in the coil

As space equals space straight Z space equals square root of straight R squared plus straight X subscript straight L superscript 2 end root space equals space square root of straight R squared plus left parenthesis 2 πfvL right parenthesis squared end root As space straight I equals space straight V over straight Z. straight P space equals space straight I squared straight R straight i. straight e. comma space straight V upwards arrow space straight L upwards arrow space rightwards double arrow space straight Z upwards arrow. space straight I downwards arrow space and space straight P downwards arrow

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