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A battery with an unknown electromotive force Ɛ and an unknown internal resistance R? was used to power a single resistor R = 6 Ω and two of the same resistors connected in parallel (see the adjacent figure). In the first case, the voltmeter showed the absolute value of the voltage difference V1 = 10V, and in the second, V2 = 8V
Calculate the electromotive force Ɛi and the internal resistance of the battery, R?.
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