WBJEE · Physics · Current Electricity
A galvanometer having internal resistance \(10 \Omega\) requires 0.01 A for a full scale deflection. To convert this galvanometer to a voltmeter of full-scale deflection at \(120 \mathrm{V}\), we need to connect a resistance of
- A \(11990 \Omega\) in series
- B \(11990 \Omega\) in parallel
- C \(12010 \Omega\) in series
- D \(12010 \Omega\) in parallel
Answer & Solution
Correct Answer
(A) \(11990 \Omega\) in series
Step-by-step Solution
Detailed explanation
Resistance \(R=\frac{V}{i_{g}}-G=\frac{120}{0.01}-10\) \[ \begin{aligned} &=12000-10 \\ R=11990 \Omega \end{aligned} \] To convert a galvanometer into a voltmeter, high resistance should connect in series.
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