COMEDK · Physics · 23. Alternating Current
In the case of an inductor
- A voltage lags the current by \(\pi / 2\)
- B voltage leads the current by \(\pi / 3\)
- C voltage leads the current by \(\pi / 2\)
- D voltage leads the current by \(\pi / 4\)
Answer & Solution
Correct Answer
(C) voltage leads the current by \(\pi / 2\)
Step-by-step Solution
Detailed explanation
In an ideal inductor, the voltage \(V\) across the inductor is related to the current \(I\) by the equation \(V = L \dfrac{dI}{dt}\). Let the current be \(I = I_0 \sin(\omega t)\). Then the voltage is \(V = L \dfrac{d}{dt}(I_0 \sin(\omega t)) = L I_0 \omega \cos(\omega t)\).…
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
- An unpolarised beam of intensity \(I_{0}\) falls on a polaroi(d)The intensity of the emergent light isCOMEDK 2018 Easy
- For the same resonant frequency, if \(L\) is changed from \(L\) to \(\dfrac{L}{3}\), then capacitance should change from \(C\) toCOMEDK 2021 Medium
- A uniform chain of length \(L\) is lying partly on a table, the remaining part hanging down from the edge of the table. If the coefficient of friction between the chain and the table is \(0.5\), what is the minimum length of the chain that should lie on the table, to prevent the chain from slipping down to the ground?COMEDK 2015 Hard
- Four masses each 2 kg are placed at the corners A, B, C, D of a mass less square frame. 40 kg mass is at the centre O of a square frame of side 0.2m. It is to be rotated about an axis passing through the centre O and perpendicular to the plane of the frame. Calculate the torque in N-m required to produce an angular acceleration of \(\dfrac{\pi}{2}\ rads^{-2}\).COMEDK 2026 Medium
- An ideal diode is connected in series with a capacitor. The free ends of the capacitor and the diode are connected across a \(220 \mathrm{~V}\) ac source. Now the potential difference across the capacitor is :COMEDK 2024 Medium
- An object is dropped from a certain point A at a height 'h' from the ground. During it's journey straight downwards, the object passes points B and C such that the ratio of time taken \(t_1\) to cover AB and \(t_2\) to cover BC is 1: \((\sqrt{2} - 1)\). What is the ratio of distances AB:BC ?COMEDK 2026 Medium
More PYQs from COMEDK
- The resistance of a \(10 \mathrm{~m}\) long wire is \(10 \Omega\). Its length is increased by \(25 \%\) by stretching the wire uniformly. The new resistance isCOMEDK 2024 Medium
- Area of the region bounded by the curve \(y=\cos x\) between \(x=-\dfrac{\pi}{2}\) and \(x=\pi\) is-----COMEDK 2025 Medium
- The universal gas law \(\left(\frac{p V}{T}=\right.\) constant \()\) is applicable toCOMEDK 2014 Easy
- \(\int \sqrt{x} e^{\sqrt{x}} d x\) is equal toCOMEDK 2013 Hard
- The number of real roots of the equation
\(x^{4}+\sqrt{x^{4}+20}=22\) isCOMEDK 2014 Easy - Which one of the following reactions does not give the correct combination of reactants and the major products formed in the reaction?COMEDK 2025 Medium