JEE Mains · Physics · STD 12 - 3. current electricity
In the given circuit, an ideal voltmeter connected across the \(10\,\Omega \) resistance reads \(2\, V\). The internal resistance \(r\), of each cell is ................... \(\Omega\)
- A \(1\)
- B \(0.5\)
- C \(1.5\)
- D \(0\)
Answer & Solution
Correct Answer
(B) \(0.5\)
Step-by-step Solution
Detailed explanation
\( R_{e q} =\frac{15 \times 10}{25}+2+2 r \) \( =8+2 r \) \(i=\frac{3}{8+2 r}\) \(2=\mathrm{i} \mathrm{R}_{\mathrm{eq}}=\frac{3}{8+2 \mathrm{r}} \times 6\) \(16+4 r=18\) \(\Rightarrow r=0.5\, \Omega\)
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