When an external resistor of resistance R1 = 14 Ω is connected across the terminals of a battery,there is a current of 6.0 A through the resistor.When a different external resistor of resistance R2 = 64.4 Ω is connected instead,the current is 2.0 A.Calculate (a)the emf of the battery and (b)the internal resistance of the battery.
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