JAMB Physics 2011 Objective — Question 36
Question 36 of 49 from the Joint Admissions and Matriculation Board (JAMB) Physics 2011 Objective paper, with the correct answer and a full explanation.
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Three similar cells each of e.m.f 2 V and internal resistance 2Ω are connected in parallel; the total e.m.f and total internal resistance are respectively
- A. A. 2V, 0.7ΩCorrect
- B. B. 6V, 0.7Ω
- C. C. 6V, 6.0Ω
- D. D. 2V, 0.7Ω
Explanation
When similar cells are connected in parallel, the total emf equals that of just one cell (2V, not the sum). The resultant internal resistance is obtained via the reciprocal law: 1/r=1/2+1/2+1/2=3/2, r=2/3Ω≈0.7Ω.
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