COMEDK · Physics · 23. Alternating Current
An electronic device operates at 2 MHz. The oscillating circuit has an inductance \(20 \times 10^{-5}\) H. What is the capacitive reactance of the resonant circuit?
- A \(5024\ \Omega\)
- B \(251.2\ \Omega\)
- C \(2512\ \Omega\)
- D \(1256\ \Omega\)
Answer & Solution
Correct Answer
(C) \(2512\ \Omega\)
Step-by-step Solution
Detailed explanation
At resonance, the capacitive reactance is equal to the inductive reactance. \(X_C = X_L = \omega L = 2\pi f L\) Given \(f = 2 \times 10^6\) Hz and \(L = 20 \times 10^{-5}\) H. \(X_C = 2 \times 3.14 \times 2 \times 10^6 \times 20 \times 10^{-5}\)…
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
- When a dielectric slab of dielectric constant \(\mathrm{k}=2\) is used to fill the space between the plates of a parallel plate capacitor, the capacitance of the capacitor is found to be \(20 \mu \mathrm{F}\). What will be the capacitance when the slab is replaced with air?COMEDK 2025 Easy
- A wire '\(l\)' m long bent into a circular loop is placed perpendicular to the magnetic field of flux density \(B \text{ Wbm}^{-2}\). Within 0.1sec, the loop is changed into a square of side '\(a\)' m and flux density is doubled. The value of e.m.f. induced isCOMEDK 2024 Medium
- A capacitor of \(2 \mu \mathrm{~F}\) is charged as shown in the figure. When the switch \(S\) is turned to position 2 , the percentage of its stored energy dissipated is
COMEDK 2024 Medium - A one \(\mathrm{kg}\) block of ice at \(-1.5^{\circ} \mathrm{C}\) falls from a height of \(1.5 \mathrm{~km}\) and is found melting. The amount of ice melted due to fall, if \(60 \%\) energy is converted into heat is (Specific heat capacity of ice is \(0.5 \mathrm{~cal} \mathrm{~g}^{-1} \mathrm{~C}^{-1}\), Latent heat of fusion of ice \(=80 \mathrm{~cal~g}^{-1}\) )COMEDK 2024 Medium
- Figure below shows a lens of refractive index, \(\mu=1.4\). \(C_1\) and \(C_2\) are the centres of curvature of the two faces of the lens of radii of curvature \(4 \mathrm{~cm}\) and \(8 \mathrm{~cm}\) respectively.
The lens behaves as aCOMEDK 2024 Medium - Two unlike charges of the same magnitude \(Q\) are placed at a distance \(d\). The intensity of the electric field at the middle point is the line joining the two charges isCOMEDK 2024 Medium
More PYQs from COMEDK
- If electrolysis of water is carried out for a time duration of 2 hours, how much electric current in amperes would be required to liberate \(100 \mathrm{~ml}\) of \(\mathrm{O}_2\) gas measured under standard conditions of temperature and pressure?COMEDK 2023 Medium
- Consider the Born-Haber cycle for the formation of an ionic compound, given below and identify the compound \((Z)\) forme(d)
COMEDK 2017 Hard - Arrange the following compounds in the decreasing order of the molar conductivities of their aqueous solutions.
\(\begin{array}{cccc}\mathrm{A} & \quad \mathrm{B} & \quad \mathrm{C} & \quad \mathrm{D} \\ {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}] \mathrm{Cl}_2\right.} & \quad {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]} & \quad {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl}} & \quad {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3}\end{array}\)COMEDK 2025 Medium - The value of \(\int_{-2}^{2}\left(a x^{3}+b x+c\right) d x\) depends on theCOMEDK 2019 Hard
- \(\displaystyle\int \dfrac{x + 1}{x(1 + x e^x)} dx =\)COMEDK 2026 Medium
- The distance of the point \((2,3,4)\) from the line \(1-x=\dfrac{y}{2}=\dfrac{1}{3}(1+z)\) isCOMEDK 2023 Medium