Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 39

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The impedance of a series circuit consist of $3 ohm$ resistance and $4 ohm$ reactance. The power factor
of the circuit is,

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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 40

In series A series LCR circular in connected to a.c. source of variable frequency

f

The graphical representation of variation of impedance

z

of the circuit with frequency

f

will be

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 41

With increase in frequency of an AC suppiy, the inductive reactance:

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 42

With increase in frequency of an AC supply, the capacitive reactance,

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 43

In an AC circuit consisting of resistance

R

and inductance

L

, the voltage across

R

is

60 V

and that across

L

is

80 V

. The total voltage across the combination is,

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 44

If emf

E = 4 \cos 1000 t v o l t

is applied to an

L - R

circuit of inductance

3 mH

and resistance

4 Ω,

the amplitude of current in the circuit is

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 45

A coil has reactance of

100 Ω

when frequency is

50 Hz

. If the frequency becomes

150 Hz

, then the reactance will be

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 46

The current in a circuit containing a capacitance

C

and a resistance

R

in series leads over the applied voltage of frequency

\frac{ω}{2 π}

by,

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 47

In a circuit, an inductance of

0.1 H

and a resistance of

1 Ω

are connected in series with an AC source of voltage

V = 5 \sin 10 t

. The phase difference between the current and applied voltage will be-