A battery of e.m.f. E and internal resis...

A battery of e.m.f. E and internal resistance r is connected to variable resistance R as shown here. Which one of the following is true?

Potential difference across the terminals of the battery is maximum when `R=r`

Current in the circuit is maximum when `R=r`

Power delivered to resistor is maximum when `R=r`

Current in the circuit is maximum when `R gt gt r`

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