Mathematics · Current Electricity
In an experiment to find the emf of a cell using a potentiometer, the length of the null point for a cell of emf 1.5 V is found to be 60 cm. If this cell is replaced by another cell of emf E, the length of the null point increases by 40 cm. The value of E is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 12.5 V✓
- 21.0 V
- 33.0 V
- 42.0 V
Correct answer
2.5 V
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