Sometimes the balance point in the potentiometer may not be obtained on the wire of the potentiometer . Under what condition does it happen ?

Explanation

Let a cell of emf E be connected across the entire length L of a potentiometer wire . Now , if the balance point is obtained at a length l during measurement of an unknown voltage `V,"then " (E)/(V)=(L)/(l)` .
The balance point is not on the potentiometer wire - this statement means that `lgtL.` . In that case , `VgtE.`