COMEDK · Physics · 23. Alternating Current
A bulb of resistance 280 Ohm is supplied with a voltage \(\mathrm{V}=400 \sin \pi \mathrm{t}\). The peak current is
- A 2.02 A
- B 2.22 A
- C 1.43 A
- D 1.11 A
Answer & Solution
Correct Answer
(C) 1.43 A
Step-by-step Solution
Detailed explanation
The given voltage is \(V = 400 \sin(\pi t)\). Comparing this with the standard form \(V = V_{peak} \sin(\omega t)\), the peak voltage is \(V_{peak} = 400\) V. The resistance of the bulb is \(R = 280\) Ohm. Using Ohm's law for the peak values, the peak current \(I_{peak}\) is…
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 particle of mass \(m\) is moving in a horizontal circle of radius \(r\) under a centripetal force given by \(\left(\dfrac{-K}{r^2}\right)\), where \(K\) is a constant. ThenCOMEDK 2022 Medium
- Two circular coils of radius '\(a\)' and '\(2 a\)' are placed coaxially at a distance ' \(x\) and '\(2 x\)' respectively from the origin along the \(\mathrm{X}\)-axis. If their planes are parallel to each other and perpendicular to the \(\mathrm{X}\) - axis and both carry the same current in the same direction, then the ratio of the magnetic field induction at the origin due to the smaller coil to that of the bigger one is:COMEDK 2024 Medium
- The resistance of a wire is \(R\) ohm. If it is melted and stretched to \(n\) times its original length, its new resistance will beCOMEDK 2021 Easy
- The basic principle used behind the working of electron microscope is:COMEDK 2026 Easy
- Two spheres of masses \(M_1\) and \(M_2\) are in air separated by a distance of d m. The gravitational force of attraction between them is F. If the space around the masses is filled with a liquid of density \(\rho\), the force between the masses will beCOMEDK 2026 Easy
-
Two charges 1C and 2C are placed at coordinates (0,3) and (4,3) respectively in an XY plane. What is the work done to put a 30C charge at the origin of the coordinate system?COMEDK 2026 Medium
More PYQs from COMEDK
- \(x=a(\theta+\sin \theta)\) and \(y=a(1-\cos \theta)\) represents the equation of a curve. If \(\theta\) changes at a constant rate \(k\) then the rate of change of the slope of the tangent to the curve at \(\theta=\dfrac{\pi}{3}\) isCOMEDK 2025 Medium
- If \(A=\{a, b, c\}, B=\{b, c, d\}\) and \(C=\{a, d, c\}\), then \((A-B) \times(B \cap C)=\)COMEDK 2016 Easy
- A sonometer string vibrates with a frequency of 400 Hz . When the length of the string is halved and the tension is altered, it begins to vibrate with a frequency of 200 Hz . The ratio of the new tension to the original tension in the string is:COMEDK 2025 Medium
- The first emission of hydrogen atomic spectrum in Lyman series appears at a wavelength ofCOMEDK 2023 Easy
- The behaviour of the function \(f(x) = \sin\left(2x + \dfrac{\pi}{4}\right)\) on \(\left(\dfrac{3\pi}{8} , \dfrac{5\pi}{8}\right)\) is:COMEDK 2026 Easy
- Three long, straight and parallel wires, carrying current, are arranged as shown in figure.
The force experienced by a \(25 \mathrm{~cm}\) length of wire \(C\) isCOMEDK 2017 Hard