Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Alternating Current>Exercise>Q 11

EASY

12th Andhra Pradesh Board

IMPORTANT

Earn 100

Why AC is preferred to DC? Please explain.

Important Questions on Alternating Current

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Alternating Current>Exercise>Q 12

220 V

ac is more dangerous than

220 V

dc. Why?

HARD

12th Andhra Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Alternating Current>Exercise>Q 13

Find average value of ac current in its first positive half cycle.

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Alternating Current>Exercise>Q 14

If $V = 50 \sin (157 t + ϕ) V$ for AC circuit, find (A) RMS value of AC voltage (B) frequency of AC voltage.

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Alternating Current>Exercise>Q 15

At what instant the value of AC current will be equal (i) half its peak value (ii)

\frac{\sqrt{3}}{2}

of its peak value for a sinusoidal AC current.

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Alternating Current>Exercise>Q 16

What is the inductive reactance of a coil if current through it is

800 m A

and the voltage across it is

40 V

?

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Alternating Current>Exercise>Q 17

Find the value of current through an inductance of

2.0 H

and negligible resistance, when connected to an a.c. source of

150 V

and

50 H z

.

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Alternating Current>Exercise>Q 18

An inductance of negligible resistance, whose reactance is

22 Ω

at

200 H z

is connected to a

220 V

,

50 H z

power line. What is the value of inductance and reactance?

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Alternating Current>Exercise>Q 19

A coil of self-inductance has inductive reactance of

88 Ω

. Calculate the self-inductance of the coil if the frequency is

50 Hz

.