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The circuit shown in Fig is used to measure the resistance R. The ammeter reads 2 A and the voltmeter 120 V. What is the value of R if the internal resistance of the voltmeter is 3000Ω? How big is the error in the measurement of the value of R if, in the calculation, the resistance of the voltmeter is taken to be infinitely large?

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R = VR0/(IR0 — V) = 61.2 ohms; the resistance calculated under the assumption that R0 →  is 1.2 ohms smaller than it actually is.

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