Q94 / 120 · VITEEE 2006 · Physics

Q-factor can be increased by having a coil of

Correct answer
A
large inductance, small ohmic resistance
B
large inductance, large ohmic resistance
C
small inductance, large ohmic resistance
D
small inductance, small ohmic resistance

Solution

Q-factor is given by $\mathrm{Q}=\frac{1}{\mathrm{R}} \sqrt{\frac{\mathrm{L}}{\mathrm{C}}}$ $\therefore$ If resistance $\mathrm{R}$ is decreased, $\mathrm{Q}$ increases and inductance $\mathrm{L}$ is increased, $\mathrm{Q}$ increases.

Hence, the correct answer is option: 'A'.

Relevant Questions

Which of the following graphs represents the correct variation of inductive reactance with angular frequency ?2024AC Circuits
In A.C. circuit in which inductance and capacitance are joined in series. Current is found to be maximum when the value of inductance is \(02023AC Circuits
In a series $L C R$ circuit the frequency of a $10 {~V}$ a.c. voltage source is adjusted in such a fashion that the reactance of the ind2023AC Circuits
For a series RLC circuit . The impedance of the circuit and phase difference between and I respectively will be2019AC Circuits
Two coils have a mutual inductance . The current changes in the first coil according to equation , where and radian . The maximum value of e2018AC Circuits
An alternating voltage of frequency is applied across a capacitor of capacitance . The impedence of the circuit is2018AC Circuits