Alternating Current, Voltage PYQs: JEE Mains Physics

Showing 1–14 of 14 questions

1. 1. The electric current in the circuit is given as \(i=i_{ o }(t / T)\). The r.m.s current for the period \(t=0\) to \(t=T\) is ___________ 2026 Easy
2. 2. An ac current is represented as
   \(\mathrm{i}=5 \sqrt{2}+10 \cos \left(650 \pi \mathrm{t}+\frac{\pi}{6}\right) \mathrm{Amp}\)
   The r.m.s value of the current is 2025 Easy
3. 3. An alternating current is given by \(\mathrm{I}=\mathrm{I}_{\mathrm{A}} \sin \omega \mathrm{t}+\mathrm{I}_{\mathrm{B}} \cos \omega \mathrm{t}\). The r.m.s current will be ______. 2025 Easy
4. 4. An alternating current is represented by the equation, \(i=100 \sqrt{2} \sin (100 \pi t)\) ampere. The RMS value of current and the frequency of the given alternating current are ________. 2025 Easy
5. 5. A alternating current at any instant is given by \(i=\left[6+\sqrt{56} \sin \left(100 \pi t+\frac{\pi}{3}\right)\right] A\). The rms value of the current is _________ A. 2024 Hard
6. 6. An alternating voltage \(\mathrm{V}(\mathrm{t})=220 \sin 100 \ \pi \mathrm{t}\) volt is applied to a purely resistive load of \(50\ \Omega\). The time taken for the current to rise from half of the peak value to the peak value is _______. 2024 Hard
7. 7. A resistance of \(40 \,\Omega\) is connected to a source of alternating current rated \(220\, V , 50 Hz\). Find the time taken by the current to change from its maximum value to \(ms\) value 2022 Hard
8. 8. The current flowing through an ac circuit is given by \(I=5 \sin (120 \pi t) A\) How long will the current take to reach the peak value starting from zero? 2022 Medium
9. 9. An \(AC\) current is given by \(I = I _{1} \sin \omega t + I _{2} \cos \omega t\). A hot wire ammeter will give a reading 2021 Hard
10. 10. An \(AC\) source rated \(220\, V , 50\, Hz\) is connected to a resistor. The time taken by the current to change from its maximum to the rms value is 2021 Medium
11. 11. An alternating current is given by the equation \(i=i_{1} \sin \omega t+i_{2} \cos \omega t\). The rms current will be 2021 Hard
12. 12. The alternating current is given by \({i}=\left\{\sqrt{42} \sin \left(\frac{2 \pi}{{T}} {t}\right)+10\right\} {A}\) The \(r.m.s.\) value of this current is \({A}\) 2021 Hard
13. 13. An alternating voltage \(v\left( t \right) = 220\,\sin \,100\pi l\,volt\) is applied to a purely resistive load of \(50\,\Omega \) . The time taken for the current to rise from half of the peak value of the peak value is.....\(ms\) 2019 Medium
14. 14. The \(AC\) voltage across a resistance can be measured using a 2015 Easy

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