The emf of the driver cell in the potentiometer experiment should be greater than the emf of the cell to be determined. Why?

Assertion : The e.m.f. of the drivercell in the potentiometer experiment should be greater than the e.m.f. of the cell to determined. reason ; the fall of potential across the potentiometer wire should not be less than the emf of the cell to be determined.

Assertion : The e.m.f. of the drivercell in the potentiometer experiment should be greater than the e.m.f. of the cell to determined.

How emf of a cell is determined ?

How emf of a cell is determined ?

The emf of the driving cell used in the main circuit of the potentiometer should be more than the potential differnce to be measured. Why?

The e.m.f. of the cell used in the main circuit of the potentiomter should be more than the potential diference to be measured. Why?