JEE Mains · Physics · STD 12 - 4. Moving charges and magnetism
A galvanometer having a coil resistance \(100 \;\Omega\) gives a full scale deflection when a current of \(1 \;\mathrm{mA}\) is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of \(10\; \mathrm{V} ?\)......\(k\Omega\)
- A \(9.9\)
- B \(8.9\)
- C \(7.9\)
- D \(10\)
Answer & Solution
Correct Answer
(A) \(9.9\)
Step-by-step Solution
Detailed explanation
\(\mathrm{i}_{\mathrm{g}}=1 \mathrm{mA}, \mathrm{R}_{\mathrm{g}}=100 \Omega\) \(\mathrm{V}=\mathrm{i}_{\mathrm{g}}\left(\mathrm{R}+\mathrm{R}_{\mathrm{g}}\right)\) \(10=1 \times 10^{-3}(\mathrm{R}+100)\) \(\mathrm{R}=9.9 \mathrm{k} \Omega\)
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