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JEE Main 2020 (5 Sep, Shift 1) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from JEE Main 2020 (5 Sep, Shift 1)

Q136JEE Main 2020 · 5 SEP · SHIFT 1Easy

Kirchhoff's Laws & Measuring Instruments

A galvanometer of resistance G is converted into a voltmeter of range 0 – 1 V by connecting a resistance R1 in series with it. The additional resistance that should be connected in series with R1 to increase the range of the voltmeter to 0 – 2 V will be:

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Answer: (c)

For 1 V range: $I_g(G + R_1) = 1$ .
For 2 V range: $I_g(G + R_1 + R) = 2 \Rightarrow G + R_1 + R = 2(G + R_1)$
$R = R_1 + G$ , so the answer is (c).

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