A potential divider circuit is constructed using a uniform resistive strip of total resistance 240 Ω240\ \Omega240 Ω between its two ends, A\text{A}A and B\text{B}B. The strip is connected across a battery of emf 6.00 V6.00\text{ V}6.00 V and internal resistance rrr as shown in the diagram.
When the sliding contact C\text{C}C is moved to end B\text{B}B and the switch is closed, the digital voltmeter reads 5.76 V5.76\text{ V}5.76 V. Calculate the internal resistance rrr of the battery.
The sliding contact C\text{C}C is then moved to a position that is 14\frac{1}{4}41 of the distance from A\text{A}A to B\text{B}B, so that the resistance of the strip between A\text{A}A and C\text{C}C is 60.0 Ω60.0\ \Omega60.0 Ω. Determine the reading on the voltmeter at this setting.