In pure inductor circuit, which quantity is lagging

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Examoogle · Accepted Answer

Current

Explanation: In a pure inductor circuit, the correct answer is A) Current. In such circuits, current lags behind voltage by a phase angle of 90 degrees. Working Principle: This lagging occurs due to the inductive property of the inductor, which opposes changes in current. As the voltage across the inductor reaches its maximum value, the current is still increasing towards its maximum value, resulting in a phase difference. Key Formulas: $V = L \frac{di}{dt}$ — the relationship between voltage, inductance, and current change over time.; $I = I_0 \sin(\omega t - \frac{\pi}{2})$ — represents current that lags voltage by \frac{\pi}{2}$. Key Points: Inductive reactance causes current to lag behind voltage.; In a pure inductor, the phase shift is always 90 degrees. Advantages: Effective for filtering and tuning applications.; Inductors can store energy in a magnetic field. Disadvantages: Can cause phase distortion in AC circuits.; Inductors may have parasitic resistances that affect efficiency. Applications: Used in transformers and inductive coils.; Essential in oscillator circuits and signal processing. Additional Info: Standard Values: Inductance values are typically measured in Henries (H).. Wrong Options Explained: Option B = Voltage is leading, not lagging; Option C = Incorrect as only current lags. Answer: A is correct — Current lags voltage in a pure inductor circuit. Exam Tip: Remember that in purely inductive circuits, the concept of phase difference is crucial for understanding how AC circuits behave.

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