The current in the inductor ______

  1. lags the voltage by π/2
  2. leads the voltage by π/2
  3. lags the voltage by π
  4. leads the voltage by π

Answer (Detailed Solution Below)

Option 1 : lags the voltage by π/2
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Detailed Solution

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CONCEPT:

  • Inductors: The coils of wire that are wound around any ferromagnetic material (iron cored) or wound around a hollow tube that increase their inductive value are called inductors.
    • The inductance (L) is measured in Henry (H) and the instantaneous voltage in volts.
    • Rate of instantaneous voltage is given by (v = L di/dt)

EXPLANATION:

  • The given diagram is a simple inductor circuit with alternating current.
    • From the phaser diagram, Inductor current lags inductor voltage by 90°.

F2 J.K 8.7.20 Pallavi D1

  • The plot of current and voltage for this very simple circuit:
    • From the current and voltage wave diagram, Inductor current lags inductor voltage by 90°.

F2 J.K 8.7.20 Pallavi D2

  • So, the correct answer will be option 1.

IMP POINT

  • Inductor current lags inductor voltage by 90°.
  • Capacitor voltage lags current by 90°.
  • In Resister only circuit, Voltage and Current are in the same phase. 
    • Or we can say there is no lag between current and voltage. 
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