Verified Solution • 2025–26 Session moderate

QPage 329: Q1: Alternating Current Solutions — HC Verma: Concepts of Physics - Volume 2

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often treat the capacitor’s “infinite resistance” as a universal block, forgetting that its reactance $X_C=1/(2pi fC)$ is infinite only at $f=0$ (DC). Remember that for any non‑zero frequency the capacitor presents a finite impedance, so it does not act as an open circuit for AC.

A capacitor acts as an infinite resistance for ______.

Multiple Choice Options

  • A DC
  • B AC
  • C DC as well as AC
  • D neither AC nor DC

Step-by-Step Verified Solution

**Answer:** (a) DC. **Step-by-Step Explanation:** A capacitor blocks DC because its reactance is infinite at zero frequency.

All Questions in this Chapter

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