Question: A battery has an emf E and an internal resistance r. When a 5.0- resistor is connected across the terminals, the current is 0.5 A.

A battery has an emf E and an internal resistance r. When a 5.0-Ω resistor is connected across the terminals, the current is 0.5 A. When this resistor is replaced by an 11.0-Ω resistor, the current is 0.25 A. Find

(a) The emf E and

(b) The internal resistance r.

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