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Answer :
The internal resistance of a battery can be calculated using the formula:
Internal resistance = (Open circuit voltage - Load voltage) / Load current
In this case, the open circuit voltage of the battery is given as 3V, and the load voltage across the terminals of the battery when connected to a 6-ohm load resistor is measured as 2.1V.
To find the load current, we can use Ohm's Law:
Load current = Load voltage / Load resistance
Substituting the given values, we have:
Load current = 2.1V / 6Ω = 0.35A
Now we can calculate the internal resistance using the formula mentioned earlier:
Internal resistance = (3V - 2.1V) / 0.35A = 0.9V / 0.35A = 2.571Ω
Therefore, the internal resistance of the battery is approximately 2.571 ohms.
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