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When switch S in the figure is open, the voltmeter V of the battery reads 3.09 V...

When switch S in the figure is open, the voltmeter V of the battery reads 3.09 V . When the switch is closed, the voltmeter reading drops to 2.96 V , and the ammeter A reads 1.66 A . Assume that the two meters are ideal, so they do not affect the circuit. (Figure 1) - From that we find that emf E = 3.09 V.


Find the internal resistance r of the battery.When switch S in the figure is open, the voltmeter

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