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With a 1400 MΩ resistor across its terminals, the terminal voltage of a certain battery is...

With a 1400 MΩ resistor across its terminals, the terminal voltage of a certain battery is 2.64 V . With only a 5.10 Ω resistor across its terminals, the terminal voltage is 1.70 V . - Find the internal resistance of this battery. and What would be the terminal voltage if the 5.10 Ω resistor were replaced by a 7.10 Ω resistor?

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