The diagram shows a capacitor *C* and a resistor *R* connected in series to an ac source. *V*_{1} and *V*_{2} are voltmeters and *A* is an ammeter:

Consider now the following statements

I. Readings in *A* and *V*_{2} are always in phase

II. Reading in *V _{1}* is ahead in phase with reading in

III. Readings in *A* and *V _{1}* are always in phase

Which of these statements is/are correct?

(1) I only

(2) II only

(3) I and II only

(4) II and III only

Concept Questions :-

Different types of AC Circuits

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In the circuit shown in figure neglecting source resistance the voltmeter and ammeter reading will respectively, will be

(1) 0*V*, 3*A*

(2) 150*V*, 3*A*

(3) 150*V*, 6*A*

(4) 0*V*, 8*A*

Concept Questions :-

Different types of AC Circuits

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In the circuit shown in the figure, the ac source gives a voltage $V=20\mathrm{cos}\left(2000\text{\hspace{0.17em}}t\right).$ Neglecting source resistance, the voltmeter and ammeter reading will be:

(1) 0*V*, 0.47*A*

(2) 1.68*V*, 0.47*A *

(3) 0*V*, 1.4 *A*

(4) 5.6*V*, 1.4 *A*

Concept Questions :-

Rms and average values

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An ac source of angular frequency *ω* is fed across a resistor *r* and a capacitor *C* in series. The current registered is *I*. If now the frequency of the source is changed to *ω*/3 (but maintaining the same voltage), the current in the circuit is found to be halved. Calculate the ratio of reactance to resistance at the original frequency *ω.*

(1) $\sqrt{\frac{3}{5}}$

(2) $\sqrt{\frac{2}{5}}$

(3) $\sqrt{\frac{1}{5}}$

(4) $\sqrt{\frac{4}{5}}$

Concept Questions :-

Different types of AC Circuits

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For a series *RLC *circuit *R* = *X _{L}* = 2

(1) $\frac{\sqrt{5}R}{2},\text{\hspace{0.17em}}{\mathrm{tan}}^{-1}\left(2\right)$

(2) $\frac{\sqrt{5}R}{2},{\mathrm{tan}}^{-1}\left(\frac{{\displaystyle 1}}{{\displaystyle 2}}\right)$

(3) $\sqrt{5}{X}_{C},{\mathrm{tan}}^{-1}\left(2\right)$

(4) $\sqrt{5}R,\text{\hspace{0.17em}}{\mathrm{tan}}^{-1}\left(\frac{{\displaystyle 1}}{{\displaystyle 2}}\right)$

Concept Questions :-

Different types of AC Circuits

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In the adjoining ac circuit the voltmeter whose reading will be zero at resonance is

(1) *V*_{1}

(2) *V*_{2}

(3) *V*_{3}

(4) *V*_{4}

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In the adjoining figure, the impedance of the circuit will be:

(1) 120 *ohm*

(2) 50 *ohm *

(3) 60 *ohm *

(4) 90 *ohm*

Concept Questions :-

Different types of AC Circuits

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Which one of the following curves represents the variation of impedance (*Z*) with frequency *f *in series *LCR* circuit

(1)

(2)

(3)

(4)

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The variation of the instantaneous current (*I*) and the instantaneous emf (*E*) in a circuit is as shown in fig. Which of the following statements is correct

(1) The voltage lags behind the current by *π* / 2

(2) The voltage leads the current by *π* / 2

(3) The voltage and the current are in phase

(4) The voltage leads the current by *π*

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The figure shows the variation of *R*, *X _{L,}* and

(1) *A*

(2) *B*

(3) *C*

(4) All points

Concept Questions :-

Different types of AC Circuits

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Difficulty Level: