EMF and potential difference statements – Rankers Physics

Combination of Batteries: Practice Problem & Solution

Consider the following statements and choose the correct option Statement (A): Electromotive force (emf) is not a force, it is the voltage difference between two terminal of a battery in open circuit. Statement (B): The potential difference across terminals of a battery having some internal resistance can never be greater than the emf of the battery.  
Statement (A) is correct while statement (B) is incorrect
Statement (A) is incorrect while statement (B) is correct
Both the statements are correct
Both the statements are incorrect

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:

Statement (A) is correct as EMF is indeed a potential difference under open circuit. Statement (B) is incorrect because during charging, the terminal potential difference is \(V = E + Ir\), which is greater than the EMF \(E\).

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