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The emf of the driver cell in the potent...

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

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If it is not so, there will be smaller fall of potential across the potentiometer wire than the emf of the cell to be determined and hence the balance point will not be obtained on the potentiometer wire.
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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.

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The balancing length for a cell in a potentiometer experiment is 45 cm. In the balanced condition, the current through the potentiometer wire is 2 A. If the total length of the potentiometer wire is 1 m and its total resistance is 60Omega , the emf of the cell is (in Volts) _________.