Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 1>Q 6

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Earn 100

The current and voltage in a circuit is given by, $i = 3.5 \sin (628 t + 30 °) A, V = 28 \sin (628 t - 30 °) V$ . The phase difference between voltage and current.

Important Questions on Alternating Current

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 1

The figure given below shows the variation of an alternating emf with time. What is the average value of the emf for the shaded part of the graph?
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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 2

A voltage

V = 60 \sin (π t)

volt is applied across a

20 Ω

resistor. What will an ac ammeter in series with the resistor read?

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 3

An alternating current source

E = 100 \sin (1000 t) V

is connected through an inductor of

10 μ H

then write down the equation of current.

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 4

An alternating voltage

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

is applied to

2 H

inductor through an a.c. ammeter. What will be reading of the ammeter?

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 5

A

15.0 μF

capacitor is connected to a

220 V, 50 Hz

source. Find the capacitive reactance and the current (RMS and peak) in the circuit. If the frequency is doubled, what happens to the capacitive reactance and the current?

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 6

A

60 μF

capacitor is connected to a

110 V

,

60 Hz

A.C. supply. Determine the rms value of the current in the circuit.

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 8

When a series combination of inductance and resistance are connected with a

10 V 50 Hz AC

source, a current of

1 A

flows in the circuit. The voltage leads the current by a phase angle of

π / 3

radian. Calculate the values of resistance and inductance.

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 9

Calculate the impedance of a condenser in order to run a bulb rated at

10 W, 60 V

when connected in series to an A.C. source of

100 V

.