Verified Solution • 2025–26 Session moderate

QPages 196-197: Q12: HC Verma: Concepts of Physics - Volume 2 Electric Current in Conductors Pages 196-197: Q12 Solution: Two non-ideal batteries are connected in series. Consider the…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently treat the internal resistances of batteries in series as if they were connected in parallel, assuming the net resistance becomes smaller. Remember that internal resistance is just an ordinary resistor; in series it adds ($R_{eq}=R_1+R_2$), so the equivalent resistance is larger than each individual value, while the emfs add algebraically ($\mathcal{E}_{eq}=\mathcal{E}_1+\mathcal{E}_2$).

Two non-ideal batteries are connected in series. Consider the following statements:- A) The equivalent emf is larger than either of the two emfs. B) The equivalent internal resistance is smaller than either of the two internal resistances.

Multiple Choice Options

  • A A and B are correct
  • B A is correct but B is wrong
  • C B is correct but A is wrong
  • D A and B are wrong

Step-by-Step Verified Solution

**Answer:** (b) A is correct but B is wrong. **Step-by-Step Explanation:** In series, equivalent emf is larger than either emf (A). Equivalent internal resistance is larger, not smaller (B wrong).

All Questions in this Chapter

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