Two cells of emf ε and internal resistance r each are connected in par…

Question

Two cells of emf ε and internal resistance r each are connected in parallel. The equivalent emf and internal resistance are

Accepted Answer

A. {'text': 'ε, r/2', 'label': 'A'}

1. For identical cells in parallel, the terminal potential difference stays ε.
2. So the equivalent emf remains ε (parallel identical cells do not add emf).
3. Two internal resistances r in parallel combine as r/2.
4. Hence equivalent single cell has emf ε and internal resistance r/2.
_Source: NCERT Class 12 Physics, Ch 3 "Current Electricity", §3 combination of cells_

Answer

{'text': '2ε, r/2', 'label': 'B'}

Answer

{'text': 'ε, 2r', 'label': 'C'}

Answer

{'text': '2ε, 2r', 'label': 'D'}