SATHEE: alternating-currents Question 13

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alternating-currents Question 13

Question: Q. 1. Which of the following combinations should be selected for better tuning of an $L - C - R$ circuit used for communication?

(a) $R = 20 Ω, L = 1.5 H, C = 35 μ F$ .

(b) $R = 25 Ω, L = 2.5 H, C = 45 μ F$ .

(d) $R = 25 Ω, L = 1.5 H, C = 45 μ F$ .

[NCERT Exemplar]

Show Answer

Solution:

Ans. Correct option : (c)

Explanation : Quality factor $(Q)$ of an $L - C - R$ circuit is given by, $Q = \frac{1}{R} \sqrt{\frac{L}{C}}$ Tuning of an $L - C - R$ circuit depends on quality factor of the circuit. Tuning will be better when quality factor of the circuit is high.

As, quality factor $(Q)$ of an $L - C - R$ circuit is given by,

$Q = \frac{1}{R} \sqrt{\frac{L}{C}}$

For $Q$ to be high, $R$ should be low, $L$ should be high and $C$ should be low.

Alternating Currents

alternating-currents Question 13

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Alternating Currents

alternating-currents Question 13

Very Short Answer Type Questions

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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