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A cell of internal resistance is connected across a resistor. A voltmeter having variable resistance G is used to measure potential difference across resistor. The plot of voltmeter reading V against G is shown. What is value of external resistor R?

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$4 Ω$

$3 Ω$

$1 Ω$

$5 Ω$

answer is A.

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Detailed Solution

When $G = \infty, V = 20 V$ and no current will pass through voltmeter.

$I = \frac{4}{1} = 4 A; R = \frac{20}{I} = \frac{20}{4} = 5 Ω$

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