What is a potentiometer? Would you prefer a voltmeter or a potentiometer to measure the e.m.f. of a battery?

What is potentiometer?Would you prefer a voltmeter or a potentiometer to measure the e.m.f of a battery?

What is a potentiometer? Why is it most accurate device in measuring emf of a cell?

Why do we prefer a potentiometer with longer wire?

What is the ratio of e/m

What is the uniform motion ? How would you represent it graphically?

You are given a potentiometer, a rheostat, one key, a driving cell for potentiometer, one galvanometer, two cells of unknown e.m.f., one two way key and some connecting wires. Using all those given drawa circuitdiagram for finding j the ratio ofthe e.m.fofthe two cells.