JEE Main Physics: AC Circuits Practice Questions

14 questions with answers and step-by-step solutions. Tap any question to see the full worked solution.

  1. Q1.
    An alternating current is given by the equation I = 10 sin(314t). What is the frequency of this current in Hertz?
    Easy
  2. Q2.
    In a pure resistive AC circuit, what is the phase difference between the voltage and the current?
    Easy
  3. Q3.
    What is the inductive reactance of an inductor of 0.1 Henry at a frequency of 50 Hertz?
    Easy
  4. Q4.
    Easy
  5. Q5.
    In a series LCR circuit at resonance, what is the power factor of the circuit?
    Easy
  6. Q6.
    In an LCR series circuit, the resonance frequency is f. If the capacitance is made 4 times its initial value, what will be the new resonance frequency?
    Medium
  7. Q7.
    A resistor of 10 ohms and an inductor of 0.1 H are connected in series to a 50 V, 50 Hz AC source. What is the phase angle between the voltage and the current?
    Medium
  8. Q8.
    An AC voltage V = 100 sin(100t) is applied to a capacitor of 1 microfarad. What is the peak current in the circuit?
    Medium
  9. Q9.
    In an AC circuit, the voltage and current are given by V = 100 sin(100t) and I = 100 sin(100t + pi/3). What is the power factor of the circuit?
    Medium
  10. Q10.
    An AC source with voltage V = V0 sin(omega t) is connected to a series LCR circuit. If the frequency of the source is varied, the power factor of the circuit is
    Hard
  11. Q11.
    In an LCR series circuit, the resonance frequency is f0. If the capacitor is replaced by two capacitors of the same capacitance connected in parallel, the new r
    Hard
  12. Q12.
    A series LCR circuit is connected to an AC voltage source. At resonance, the voltage across the inductor is 100V. If the quality factor of the circuit is 10, wh
    Hard
  13. Q13.
    An inductor of inductance Land a resistor of resistance Rare connected in series to an AC source of voltage V = V0 sin(omega t). The current in the circuit is I
    Hard
  14. Q14.
    In an AC circuit, the instantaneous current is given by i = 4 sin(100 pit + pi/3) amperes. What is the RMS value of the current?
    Hard

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