Verified Solution • 2025–26 Session moderate

QPages 328-329: Q1: HC Verma: Concepts of Physics - Volume 2 Alternating Current Pages 328-329: Q1 Solution: What is the reactance of a capacitor connected to a constant DC …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often plug ω=0 into $X_C=1/(omega C)$ and claim the expression is undefined or zero, forgetting that $1/0$ tends to $\infty$. Remember that for a pure DC source ($\omega=0$) a capacitor behaves like an open circuit, i.e., an infinite reactance, not a short.

What is the reactance of a capacitor connected to a constant DC source?

Step-by-Step Verified Solution

**Answer:** Infinite. **Step-by-Step Explanation:** For a DC source, the angular frequency

\omega = 0

. The reactance of a capacitor is given by

X_C = \frac{1}{\omega C}

. As

\omega \to 0

,

X_C \to \infty

. Hence, a capacitor acts as an infinite resistance for DC and blocks it completely [citation:14][citation:16].

All Questions in this Chapter

QPage 329: Q1 QPage 329: Q2 QPage 329: Q3 QPage 329: Q4 QPage 329: Q5 QPage 329: Q6 QPage 329: Q7 QPage 329: Q8 QPage 329: Q9 QPage 329: Q10 QPage 329: Q11 QPages 328-329: Q1 QPages 328-329: Q2 QPages 328-329: Q3 QPages 328-329: Q4 QPages 328-329: Q5 QPages 328-329: Q6 QPages 328-329: Q7 QPages 328-329: Q8 QPages 328-329: Q9 QPages 328-329: Q10 QPages 328-329: Q11 QPages 328-329: Q12 QPages 328-329: Q13 QPages 328-329: Q14 QPages 329-330: Q1 QPages 329-330: Q2 QPages 329-330: Q3 QPages 329-330: Q4 QPages 329-330: Q5 QPages 329-330: Q6 QPages 329-330: Q7 QPages 330-331: Q1 QPages 330-331: Q2 QPages 330-331: Q3 QPages 330-331: Q4 QPages 330-331: Q5 QPages 330-331: Q6 QPages 330-331: Q7 QPages 330-331: Q8 QPages 330-331: Q9 QPages 330-331: Q10 QPages 330-331: Q11 QPages 330-331: Q12 QPages 330-331: Q13 QPages 330-331: Q14 QPages 330-331: Q15 QPages 330-331: Q16 QPages 330-331: Q17 QPages 330-331: Q18 QPages 330-331: Q19

Related Learning Resources & Exam Preparation

Chapter Practice Bank

Practice all topic-wise questions from Alternating Current

Reference Textbook Solutions

Explore complete chapter exercises for HC Verma: Concepts of Physics - Volume 2

Competitive PYQ Question Bank

Browse year-wise authentic previous years' questions with solutions

Authentic CBT Mock Tests

Simulate official exam environment with live timer and percentile scoring