WBJEE · Physics · Current Electricity
In an experiment on a circuit as shown in the figure, the voltmeter shows \(8 \mathrm{~V}\) reading. The resistance of the voltmeter is,
- A \(20 \Omega\)
- B \(320 \Omega\)
- C \(160 \Omega\)
- D \(1.44 \mathrm{k} \Omega\)
Answer & Solution
Correct Answer
(C) \(160 \Omega\)
Step-by-step Solution
Detailed explanation
Hint: Voltage across \(20 \Omega=2 \mathrm{~V}\) Main current \(=\frac{2}{20}=0.1 \mathrm{~A}\) Current through \(160 \Omega=\frac{8}{160}=\frac{1}{20}=0.05 \mathrm{~A}\) Also, \(8 \mathrm{~V}=0.05 \times \mathrm{R}\) \(R=\frac{8}{0.05}=160 \Omega\)
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