Physics · Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel
In potentiometer experiment, null point is obtained at a particular point for a
In potentiometer experiment, null point is obtained at a particular point for a cell on potentiometer wire \( x \) cm long. If the length of the potentiometer wire is increased without changing the cell, the balancing length will (Driving source is not changed)
- A. increase
- B. decrease
- C. not change
- D. becomes zero
Step-by-step solution
The balancing length is given by l = (E L)/V, where E is cell emf, V is driving source voltage, and L is wire length. Increasing L reduces potential gradient, so longer balancing length is needed for same E.
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