AP EAMCET · PHYSICS · Current Electricity
A battery of \(e m f 8 \mathrm{~V}\) and internal resistance \(0.5 \Omega\) is being charged by a 120 V dc supply using a series resistor of \(15.5 \Omega\). The terminal voltage of 8 V battery during charging is
- A 11.5 V
- B 1.15 V
- C 115 V
- D 0.5 V
Answer & Solution
Correct Answer
(A) 11.5 V
Step-by-step Solution
Detailed explanation
\(I=\frac{120-8}{15.5+0.5}=7 \mathrm{~A}\) \(\therefore \quad\) The potential difference across 8 V battery is \(\mathrm{V}=\mathrm{E}+\mathrm{I}_{\mathrm{r}}=8+7 \times 0.5=11.5 \mathrm{~V}\)
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