Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
COMEDK2023Morning ShiftPhysicsAlternating CurrentActual

In the case of an inductor

Options

  1. Avoltage lags the current by / 2
  2. Bvoltage leads the current by / 3
  3. Cvoltage leads the current by / 2
  4. Dvoltage leads the current by / 4

Correct answer

C. voltage leads the current by / 2

Step-by-step solution

In an ideal inductor, the voltage V across the inductor is related to the current I by the equation V = L dI dt . Let the current be I = I₀ ( t) . Then the voltage is V = L d dt (I₀ ( t)) = L I₀ ( t) . Using the trigonometric identity ( t) = ( t + / 2) , we get V = V₀ ( t + / 2) , where V₀ = I₀ L . Comparing the phases of current and voltage, the voltage leads the current by a phase angle of / 2 . Answer: voltage leads the current by / 2

Practice Alternating Current on Quantrex Academy →

More from Alternating Current

An electronic device operates at 2 MHz. The oscillating circuit has an inductance 20 10⁻⁵ H. What is the capacitive reactance of the resonant circuit? 2026When a current of 2.5 A passes through the primary coil of a transformer of 200 number turns, the magnetic flux linked with the secondary coil having 400 turns is 600 10⁻⁶ T m^2 . 2026In a given circuit, the instantaneous values of the alternating voltage and current are V = 0.5 (80 t + 3 ) volt and I = 0.5 (80 t) ampere respectively. Find the average power cons 2026A source of alternating emf = ₀ ( t) is connected to a capacitor. Then the instantaneous current in the circuit is: 2026If wattless current flows in an AC circuit, then the circuit is: 2026A solenoid having resistance R = 60 and inductance L = 0.4 H is connected to an AC source V = 100 2 200t . Find the maximum current. 2026In a circuit containing a pure resistor connected to an AC source, 2026A light bulb rated 100 W is connected to an AC source of 220 V, 50 Hz. The rms current through the bulb is 2026 Full Alternating Current list All COMEDK PYQs