Current Electricity

Question

To measure the internal resistance of a battery, potentiometer is used. For …, the balance point is observed at … and for … the balance point is observed at …. The internal resistance of the battery is approximately :

Accepted Answer

Option B. To measure the internal resistance of a battery using a potentiometer, we need to understand the principle behind it. The potentiometer is used to measure the voltage across the battery (emf) under different conditions. The balance length corresponds to the emf of the battery when no current is drawn, whereas under load, it corresponds to the terminal voltage.

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Current Electricity

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