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A coil of self-inductance L is connected...

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

A

Frequency of the AC source is decreased

B

Number of turns in the coil is reduced

C

A capacitance of reactance Xc -XI is included in the same circuit

D

An iron rod is inserted in the coil

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Knowledge Check

  • Which of the following statement are not correct ? (i) A capacitor is connected in series with a bulb. When this combination is connected to an A.C. source, the bulb does not glow. (ii) In a series A.C. circuit the applied voltage is not equal to the algebraic sum of voltages across the different elements of the circuit. (iii) A variable capacitor is connected in series with a bulb and this combination is connected to an A.C. source. If the capacitance of the variable capacitor is decreased then the brightness of the bulb is reduced. (iv) A capacitor is connected in series with a bulb and this combination is connected to a D.C. source When the voltage of the source is increased, the brightness of the bulb will increase.

    A
    (i) and (ii)
    B
    (ii) and (iii)
    C
    (i) and (iv)
    D
    (iii) and (iv)

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