Heating Effect of Current and Electrical Measuring Instruments | Physics JEE previous year questions with Solutions

(200)

Given potential across Voltmeter = 1V

$∴ Current in 100 Ω = \frac{1}{100} A = i_{1}$

$200 Ω = \frac{3}{100} A \Rightarrow$ as total potential $= 4 V_{1} & 1 V$ is drop across $100 Ω$

Let current in voltmeter = i

$i_{1} + i_{2} = i_{0}$

$i_{2} + \frac{1}{100} = \frac{3}{200}$

$i_{2} + \frac{3}{200} - \frac{1}{100} = \frac{1}{200} A_{1}$

$V = I R_{1} \Rightarrow 1 = \frac{1}{200} (r), \Rightarrow r = 200 Ω$

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