A battery of emf 'E' and internal resistance 'r' is connected to a resistor of resistance ′r′1 and Q Joules of heat is produced in a certain time 't'. When the same battery is connected to another resistor of resistance ′r′2 the same quantity of heat is produced in the same time 't'. Then, the value of 'r' is :
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square root of r1.r2
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