MHT CET · Physics · Current Electricity
The voltmeter has range 10 V and its internal resistance is \(50 \Omega\). To increase the range of voltmeter to 15 V , the resistance which is to be connected is
- A \(125 \Omega\) resistance in parallel
- B \(125 \Omega\) resistance in series
- C \(25 \Omega\) resistance in parallel
- D \(25 \Omega\) resistance in series
Answer & Solution
Correct Answer
(D) \(25 \Omega\) resistance in series
Step-by-step Solution
Detailed explanation
\(R_s = R_v \left(\frac{V'}{V} - 1\right)\) \(R_s = 50 \, \Omega \left(\frac{15 \text{ V}}{10 \text{ V}} - 1\right)\)
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