Ncert Exercises & Solutions

Which of the following combinations should be selected for better tuning of an LCR circuit used for communication?
1. \(R = 20~\Omega,~L= 1.5~\text{H}, ~C = 35~\mu \text{F}\)
2. \(R = 25~\Omega,~L= 2.5~\text{H}, ~C = 45~\mu \text{F}\)
3. \(R = 15~\Omega,~L= 3.5~\text{H}, ~C = 30~\mu \text{F}\)
4. \(R = 25~\Omega,~L= 1.5~\text{H}, ~C = 45~\mu \text{F}\)

Step 1: Quality factor (Q) of an L

-

-

R circuit is given by,

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

where R is resistance, L is the inductance and C is the capacitance of the circuit.

Step 2: To make Q high, L should be high and C should be low.

These conditions are best satisfied by the values given in option (c).

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions