Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 55

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If in a series $L C R$ AC circuit, the rms voltage across $L, C$ and $R$ are $V_{1}, V_{2}$ and $V_{3}$ respectively, then the voltage of the source is always:

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Important Questions on Alternating Current

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 56

In the series $L C R$ circuit as shown in figure, the voltmeter and ammeter readings are :

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 57

An A.C. voltage source of variable angular frequency

ω

and fixed amplitude

V

connected in series with a capacitance

C

and an electric bulb of resistance

R

(inductance zero). When

ω

is increased,

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 58

In a circuit,

L, C

and

R

are connected in series with an alternating voltage source of frequency

f .

The current leads the voltage by

45 ° .

The value of

C

is ?

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 59

In an

L C R

series A.C. circuit, the voltage across each of the components inductor

L, capacitor C and resistor R

is

50 V

. The voltage across the L.C. combination will be,

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 60

The phase difference between the alternating current and emf is

\frac{π}{2}

. Which of the following cannot be the constituent of the circuit?

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 61

An alternating voltage

E = 200 \sqrt{2} \sin (100 t)

is connected to a

1

micro farad capacitor through an AC ammeter. The reading of the ammeter shall be:

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 62

A

0.21 H

inductor and a

88 Ω

resistor are connected in series to a

220 V, 50 Hz

AC source. The current in the circuit and the phase angle between the current and the source voltage are respectively.

(

Use

π = \frac{22}{7})

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 63

An

L C R

series circuit with

100 Ω

resistance is connected to an

A C

source of

200 V

and angular frequency

300 radians per second

. When only the capacitance is removed, the current lags behind the voltage by

60 °

. When only the inductance is removed, the current leads the voltage by

60 °

. Then, the current and power dissipated in

L C R

circuit are, respectively