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MHT CET 2025 (26 Apr, Shift 1) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from MHT CET 2025 (26 Apr, Shift 1)

Q33MHT CET 2025 · 26 APR · SHIFT 1Medium

Kirchhoff's Laws & Measuring Instruments

When a resistance of $100\ \Omega$ is connected in series with a galvanometer of resistance ' G ', its range is ' $V$ '. To double its range, a resistance of $1000\ \Omega$ is connected in series. The value of ' $G$ ' is

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Answer: (b)

Range $V = I_g(G + R)$ with fixed $I_g$ .
The intended reading is that the $1000\ \Omega$ replaces the $100\ \Omega$ : $I_g(G + 1000) = 2 I_g(G + 100)$ .
$G + 1000 = 2G + 200 \Rightarrow G = 800\ \Omega$
So the answer is (b) $800\ \Omega$ .

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