Instead of voltmeter, potentiometer is always used to measure e.m.f. of cell, because at the null point, the potentiometer

Why do we prefer a potentiometer to measure e.m.f. of a cell rather than a voltmeter?

Potentiometer is superior to voltmeter because

Potentiometer is superior to voltmeter because

In the potentiometer for measuring the emf of the cell, at null point no current flows through :

Assertion: Potentiometer measures correct value of emf of a cell. Reason: No current flows through cell at null point of potentiometer.

Assertion: Potentiometer measures correct value of emf of a cell. Reason: No current flows through cell at null point of potentiometer.