NEET | 2013Alternating CurrentEasy
Question
A coil is self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when :
Options
A.an iron rod is inserted in the coil.
B.frequency of the AC source is decreased.
C.number of turns in the coil is reduced.
D.A capacitance of reactance XC = XL is included in the same circuit.
Solution
Brightness of the bulb
• decreases when an iron rod is inserted in the coil as impedance of circuit increases.
• increases when frequency of the AC source is decreased as impedance of circuit decreases.
• Increases when number of turns in the coil is reduced as impedance of circuit decreases.
• increases when a capacitance of reactance XC = XL is included in the circuit as impedance of circuit decreases.
Create a free account to view solution
View Solution FreeMore Alternating Current Questions
An AC current is given by I = I0 + I1 sin ωt then its rms value will be...If LCR circuit is connected in parallel then impedance will be -...If frequency of alternating source is made zero then which of the following statement is true :-...If alternating current of rms value ′a′ flows through resistance R then power loss in resistance is :-...In an L− C − R series circuit, R = 10 Ω , XL = 8Ω and Xc = 6 Ω the total impedance of the cir...