Combination of Batteries: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Combination of Batteries. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true: When a battery is being charged, the terminal voltage is \(V = \varepsilon + Ir\), which is greater than its emf \(\varepsilon\). Reason (R) is also true, as it correctly describes the terminal voltage when the battery is discharging (current is taken from it). However, (R) is not the correct explanation for (A), as (A) refers to a charging scenario (where \(V > \varepsilon\)), while (R) refers to a discharging scenario (where \(V < \varepsilon\)).