Verified Solution • 2025–26 Session moderate

QPage 329: Q10: HC Verma: Concepts of Physics - Volume 2 Alternating Current Page 329: Q10 Solution: An alternating current of peak value 14 A is used to heat a…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often equate the AC peak current with the DC current needed for the same heating. The power dissipated in a resistor is proportional to the mean of $I^2$, which for a sinusoid is $(I_{ ext{peak}}/sqrt{2})^2$. Thus the equivalent DC current is the RMS value, $I_{ ext{DC}}=I_{ ext{peak}}/sqrt{2}approx10 ext{ A}$, not the peak 14 A.

An alternating current of peak value 14 A is used to heat a metal wire. To produce the same heating effect, a constant current i can be used, where i is

Multiple Choice Options

  • A 14 A
  • B about 20 A
  • C 7:00 AM
  • D about 10 A

Step-by-Step Verified Solution

**Answer:** (d) about 10 A. **Step-by-Step Explanation:** For the same heating effect, DC current = rms current = 14/�2 � 10 A.

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