A coil of self-inductance `L` is connected in series with a bulb `B` and an `AC` source. Brightness of the bulb decreases whenA. frequency of the AC source is decreasedB. number of turns in hte coil is reducedC. a capacitance of reactance `X_(C) = X_(L)` is included in the same circuit.D. an iron rod is inserted in the coil

A coil of self-inductance `L` is connected in series with a bulb `B` a

1.	A coil of self-inductance `L` is connected in series with a bulb `B` and an `AC` source. Brightness of the bulb decreases whenA. frequency of the AC source is decreasedB. number of turns in hte coil is reducedC. a capacitance of reactance `X_(C) = X_(L)` is included in the same circuit.D. an iron rod is inserted in the coil
Answer» Correct Answer - D `Z= sqrt(R^(2)+X_(L)^(2)) = sqrt(R^(2)+(2pifvL)^(2))` As, `I=V/Z, P=I^(2)R` i.e, `V uarr,Luarr= Zuarr,Idarr` and `Pdarr`

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