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When an external resistor of resistance R1 = 16 is connected to the terminals of a battery, a current of 6.0 A flows through the resistor. When an...

When an
external resistor of resistance R1 = 16 Ω is
connected to the terminals of a battery, a current of 6.0 A flows through the
resistor. When an external resistor of resistance R2= 62.4 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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