Verified Solution • 2025–26 Session moderate

QPages 217-218: Q2: HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Pages 217-218: Q2 Solution: A constant current i is passed through a resistor. Taking the…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often mistakenly assume the power remains constant ($P = I^2R$ with fixed $R$) or incorrectly apply the constant voltage formula ($P = V^2/R$), leading them to select a flat or decreasing curve. You must recognize that for a constant current source, the increasing resistance due to temperature directly causes the thermal power to rise, resulting in an upward-bending curve.

A constant current i is passed through a resistor. Taking the temperature coefficient of resistance into account, indicate which of the plots shown in the figure best represents the rate of production of thermal energy in the resistor.

Multiple Choice Options

  • A a) Straight line parallel to the time axis,
  • B b) Straight line with a positive slope,
  • C c) Curve bending upwards with an increasing slope,
  • D d) Curve bending downwards

Step-by-Step Verified Solution

**Answer:** Plot c. **Step-by-Step Explanation:** The rate of production of thermal energy P = I_R. As temperature increases, R increases, so P increases. Plot c represents this.

All Questions in this Chapter

QPage 217: Q1 QPage 217: Q2 QPage 217: Q3 QPage 217: Q4 QPage 217: Q5 QPage 217: Q6 QPage 217: Q7 QPage 217: Q8 QPage 217: Q9 QPage 218: Q1 QPage 218: Q2 QPage 218: Q3 QPage 218: Q4 QPage 218: Q5 QPages 217-218: Q1 QPages 217-218: Q2 QPages 217-218: Q3 QPages 217-218: Q4 QPages 217-218: Q5 QPages 217-218: Q6 QPages 217-218: Q7 QPages 217-218: Q8 QPages 218-219: Q1 QPages 218-219: Q2 QPages 218-219: Q3 QPages 218-219: Q4 QPages 218-219: Q5 QPages 218-219: Q6 QPages 218-219: Q7 QPages 218-219: Q8 QPages 218-219: Q9 QPages 218-219: Q10 QPages 218-219: Q11 QPages 218-219: Q12 QPages 218-219: Q13 QPages 218-219: Q14 QPages 218-219: Q15 QPages 218-219: Q16 QPages 218-219: Q17 QPages 218-219: Q18 QPages 218-219: Q19 QPages 218-219: Q20 QPages 218-219: Q21 QPages 218-219: Q22 QPages 218-219: Q23 QPages 218-219: Q24

Related Learning Resources & Exam Preparation

Chapter Practice Bank
Practice all topic-wise questions from Thermal and Chemical Effects of Electric 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