COMEDK · Physics · 23. Alternating Current
If wattless current flows in an AC circuit, then the circuit is:
- A LR circuit
- B Purely capacitive circuit
- C Purely resistive circuit
- D LCR circuit
Answer & Solution
Correct Answer
(B) Purely capacitive circuit
Step-by-step Solution
Detailed explanation
The average power dissipated in an AC circuit is given by \(P = V_{rms} I_{rms} \cos \phi\), where \(\phi\) is the phase difference between the voltage and the current. For wattless current, the average power dissipated must be zero, which means \(P = 0\). This implies…
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
- 1 kg of water at \(100^\circ\)C is converted to steam at the same temperature. Volume of 1 cc of water changes to \(1671 \times 10^3\) cc on boiling. The change in internal energy of the system is (Latent Heat of vaporisation of water is \(22.68 \times 10^5\ J\ kg^{-1}\); 1 atm \(= 1.0 \times 10^5\) Pa)COMEDK 2026 Medium
- Applying a constant torque the speed of a flywheel is increased from 1800 rpm to 2400 rpm in 10 seconds. The number of revolutions made by the flywheel during this time is:COMEDK 2025 Easy
- The power dissipated across the \(16 \Omega\) resistor in the circuit is 2 watts. The power dissipated in watt units across the \(4 \Omega\) resistor is:
COMEDK 2025 Medium - Temperature coefficient of resistance of platinum is \(4 \times 10^{-3} / \mathrm{K}\) at \(20^{\circ} \mathrm{C}\). Temperature at which increase in resistance of platinum is \(10 \%\) its value at \(20^{\circ} \mathrm{C}\) isCOMEDK 2016 Hard
- A \(5.80 \mu \mathrm{~F}\) parallel plate air capacitor has a plate separation of 5 mm and is charged to a potential difference of 400 V . The energy density in the region between the plates isCOMEDK 2024 Medium
- Eddy currents are produced in a material, when it isCOMEDK 2016 Easy
More PYQs from COMEDK
- Two statements, One Assertion [A ] and the other Reason [ R ] are given. Identify the correct option Assertion [A]: The decreasing order of the acidic character of the following is \(\mathrm{B}>\mathrm{D}>\mathrm{A}>\mathrm{C}\)
Reason \([\mathrm{R}]\) : Fluorine has larger -I effect than Cl and Br .COMEDK 2025 Medium - In how many ways can the word "CHRISTMAS" be arranged so that the letters '\(\mathrm{C}\)' and '\(\mathrm{M}\)' are never adjacent?COMEDK 2024 Medium
- The maximum kinetic energy of emitted electrons in a photoelectric effect does not depend uponCOMEDK 2018 Easy
- \(56 \mathrm{~g}\) of nitrogen and \(8 \mathrm{~g}\) of hydrogen gas are heated in a closed vessel. At equilibrium \(34 \mathrm{~g}\) of ammonia are present. The equilibrium number of moles of nitrogen, hydrogen and ammonia are respectivelyCOMEDK 2016 Hard
- For any vector \(\vec{p}\), the value of \(\left[2\left\{|\vec{p} \times \hat{\imath}|^2+|\vec{p} \times \hat{\jmath}|^2+|\vec{p} \times \hat{k}|^2\right\}\right]\) isCOMEDK 2025 Medium
- From a group of 8 people 6 are to be chosen such that if a person \(A\) is chosen person \(B\) must also be chosen. The number of selections that can be made isCOMEDK 2025 Medium