Physics · Current Electricity
A cell of emf E is connected across an external resistance R. When a current 'I' is drawn from the cell, the potential difference across the electrodes of the cell drops to V. The internal resistance 'r' of the cell is given by:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1E - VVR✓
- 2(E - V)RI
- 3E - VR
- 4E - VER
Correct answer
E - VVR
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