Switch Open,Switch Closed

A battery has an EMF (Electromotive Force ) of 6 V\displaystyle 6\text{ V} and an internal resistance of 0.4 Ω\displaystyle 0.4 \ Ω. It is connected to a 2.6 Ω\displaystyle 2.6\ Ω resistor through a SPST (single pole, single throw) switch.

Find the potential difference between the terminals of the battery when the switch is open and when the switch is closed, in volts.

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