COMEDK · Physics · 23. Alternating Current
For a series \(L-C-R\) circuit at resonance, the statement which is not true ?
- A Peak energy stored by a capacitor = peak energy stored by an inductor
- B Average power \(=\) Apparent power
- C Wattless current is zero.
- D Power factor is zero.
Answer & Solution
Correct Answer
(D) Power factor is zero.
Step-by-step Solution
Detailed explanation
In series \(L-C-R\) circuit, \[ \begin{aligned} X_{L} &=X_{C} \\ \therefore \quad & Z=\sqrt{R^{2}+\left(X_{L}-X_{C}\right)^{2}} \end{aligned} \]…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A mercury-198 nucleus is bombarded by a neutron, which causes a nuclear reaction
\({}^{1}_{0}n + {}^{198}_{80}Hg \longrightarrow {}^{197}_{79}Au + X\)
What is the unknown product particle X?COMEDK 2026 Easy - If \(C\) be the capacitance and \(V\) be the electric potential, then the dimensional formula of \(\mathrm{CV}^2\) isCOMEDK 2023 Easy
- A parallel plate capacitor has a capacity \(C\). The separation between the plates is doubled and a dielectric medium is inserted between the plates. If the capacity is \(3 C\), then the dielectric constant of the medium will beCOMEDK 2015 Medium
- The potential to which a conductor is raised, depends onCOMEDK 2017 Easy
- Consider a thin spherical shell of radius \(R\) consisting of uniform surface charge density \(s\). The electric field at a point of distance \(x\) from its centre and outside the shell isCOMEDK 2020 Medium
- A plane electromagnetic wave of frequency \(20 \mathrm{MHz}\) travels through a space along \(x\)-direction. If the electric field vector at a certain point in space is \(6 \mathrm{Vm}^{-1}\), then what is the magnetic field vector at that point?COMEDK 2023 Easy
More PYQs from COMEDK
- \(90 \mathrm{~dB}\) sound is \(x\) times more intense than \(40 \mathrm{~dB}\) sound, then \(x\) isCOMEDK 2016 Medium
- The current sensitivity of a galvanometer having 20 divisions is \(10 \mu \mathrm{A} /\) div. If the resistance of the galvanometer is \(100 \Omega\) then the value of the resistance to be used to convert this galvanometer in to an voltmeter to read up to \(1 \mathrm{~V}\) is :COMEDK 2023 Medium
- Specific resistance of a conductor material increases withCOMEDK 2016 Easy
- \(\text { If } I_n=\int_\limits0^{\dfrac{\pi}{4}} \tan ^n x d x \text {, for } n \geq 2 \text {, then } I_n+I_{n-2}=\)COMEDK 2024 Medium
- Which one of the following is an example of step growth polymerisation?COMEDK 2023 Easy
- The locus of the point which moves such that the ratio of its distances from two fixed points in the plane is always a constant \(k( < 1)\) isCOMEDK 2016 Easy