JEE Mains · Physics · STD 12 - 3. current electricity
As shown in the figure, the voltmeter reads \(2\,V\) across \(5\,\Omega\) resistor. The resistance of the voltmeter is \(.......\,\Omega\).
- A \(18\)
- B \(17\)
- C \(20\)
- D \(19\)
Answer & Solution
Correct Answer
(C) \(20\)
Step-by-step Solution
Detailed explanation
\(i_1=\frac{2\,V}{5\,\Omega}=\frac{2}{5}\,A\) \(i=\frac{1 V}{2 \Omega}=\frac{1}{2}\,A\) \(\therefore \text { Current through voltmeter }=i-i_1\) \(=\frac{1}{2}-\frac{2}{5}=\frac{5-4}{10}=\frac{1}{10}\,A\) \(\therefore \text { For voltmeter }\)…
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