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A battery has an emf of 15.0 V. The terminal voltage of the battery is 12.2...

A battery has an emf of 15.0 V. The terminal voltage of the battery is 12.2 V when it is delivering 14.0 W of power to an external load resistor R.

(a) What is the value of R?
_____ Ω

(b) What is the internal resistance of the battery?
______ Ω

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