Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 20206 SeptemberMorning Shift
Exam
JEE Main
Year
2020
Date
6 September
Shift
Morning Shift
Subject
Physics
Chapter
Alternating Current

JEE Main 2020 · 6 September · Morning Shift · Physics · Alternating Current

An AC circuit has R = 100Ω, C = 2 and L = 80mH, connected in...

An ACAC circuit has R=100Ω,C=2\muFR = 100Ω, C = 2\muF and L=80mH,L = 80mH, connected in series. The quality factor of the circuit is :

Options

  1. A2
  2. B0.5
  3. C20
  4. D400

Correct answer

A. 2

Step-by-step solution

The quality factor of LCR circuit is given by Q=\omegaLR=1RLC=110080×10−32×10−6=2Q = \dfrac{\omegaL}{R} = \dfrac{1}{R}\sqrt{\dfrac{L}{C}} = \dfrac{1}{100}\sqrt{\dfrac{80 \times {10}^{- 3}}{2 \times {10}^{- 6}}} = 2
Practice Alternating Current on Quantrex Academy →

More from Alternating Current

Consider a circuit consisting of a capacitor of capacitance C and a coil with N turns per… JEE Advanced 2026A LCR series circuit driven with E_ rms = 90 V at frequency f_d = 30 Hz has resistance R… JEE Main 2026A series LCR circuit with R = 20\ Ω , L = 1.6 H and C = 40\ is connected to a variable… JEE Main 2026An a.c. source of angular frequency ω is connected across a resistor R and a capacitor C… JEE Main 2026An inductor of 10 mH, capacitor of 0.1\ μ F and a resistor of 100\ Ω are connected in… JEE Main 2026The figure given below shows an LCR series circuit with two switches S_1 and S_2 . When… JEE Main 2026An inductor stores 16 J of magnetic field energy and dissipates 32 W of thermal energy… JEE Main 2026The electric current in the circuit is given as i=i_ o (t / T) . The r.m.s current for… JEE Main 2026 Full Alternating Current list All JEE Main PYQs