Verified Solution • 2025–26 Session
moderate
QPages 328-329: Q13: HC Verma: Concepts of Physics - Volume 2 Alternating Current Pages 328-329: Q13 Solution: A resistance is connected to an AC source. If a capacitor is…
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often assume that adding any reactive element always lowers the average power in a resistor, overlooking that series reactances add algebraically ($X_{total}=X_L-X_C$). When a small inductor follows a capacitor, it can partially cancel the capacitive reactance, reduce the total impedance, and therefore increase the current and the resistor’s average power. Always compute the net reactance before concluding the effect on power.
A resistance is connected to an AC source. If a capacitor is included in the series circuit, will the average power absorbed by the resistance increase or decrease? If an inductor of small inductance is also included in the series circuit, will the average power absorbed increase or decrease further?
Step-by-Step Verified Solution
**Answer:** Decrease, then increase.
**Step-by-Step Explanation:**
Adding a capacitor increases the impedance , so the current and average power decrease. Adding a small inductor reduces the net reactance to , decreasing the impedance and increasing the power [citation:14].
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