Alternating current is flowing in inductance L and resistance R . The frequency of source is ω 2 π . Which of the following statement is correct?

For high frequency, the limiting value of impedance is ω L .

For low frequency, the limiting value of impedance is L .

For high frequency, the limiting value of impedance is R .

For low frequency, the limiting value of impedance is ω L .

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A resonant AC circuit contains a capacitor of capacitance $10^{- 6} F$ and an inductor of $10^{- 4} H$ . The frequency of electrical oscillations will be :-

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Important Questions on Alternating Current

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 30

A resistance of

300 Ω

and an inductance of

1 / π

henry are connected in a series to an

A C

voltage of

20 V

and

200 Hz

frequency. The phase angle between the voltage and current is

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 32

12 Ω

resistor and a

0.21 H

inductor are connected in series to an AC source operating at

20 V, 50 Hz

. The phase angle between the current and the source voltage is

HARD

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 33

110 V, 60 W

lamp is run from a

220 V AC

mains using a capacitor in series with the lamp, instead of a resistor. The voltage across the capacitor is about

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 34

The resistance that must be connected in series with the inductance of

0.2 H

in order that the phase difference between current and e.m.f. may be

45^{\circ}

when the frequency is

50 Hz

, is:-

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 35

An inductive circuit contains resistance of 10 ohms and an inductance of 20 H. If an A.C. voltage of 120 volt and frequency 60 Hz is applied to this circuit, the current would be nearly

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 36

A student connects a long air cored-coil of manganin wire to a

100 V

D.C. supply and records a current of

25 A

. When the same coil is connected across

100 V 50 Hz

a.c. the current reduces to

20 A

, the reactance of the coil is:-

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 37

The graph shows variation of I with f for a series R-L-C network. Keeping L and C constant. If R decreases:

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(a) Maximum current (I_m) increases
(b) Sharpness of the graph increases
(c) Quality factor increases
(d) Band width increases

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 38

Alternating current is flowing in inductance

L

and resistance

R

. The frequency of source is

\frac{ω}{2 π}

. Which of the following statement is correct?

A resonant AC circuit contains a capacitor of capacitance 10-6 F and an inductor of 10-4 H. The frequency of electrical oscillations will be :-

Important Questions on Alternating Current

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A resonant AC circuit contains a capacitor of capacitance $10^{- 6} F$ and an inductor of $10^{- 4} H$ . The frequency of electrical oscillations will be :-