Of what material is a potentiometer wire normally made?

Of which material is a potentionmeter wire normally made and why?

By which material is a potentiometer wire normally made and why?

Why is a potentiometer named as potentiometer?

A 10 meter long wire of uniform cross section of 20 Omega resistance is used as a potentiometer wire. This wire is connected in series with a battery of 5V along with an external resistance of 480 Omega if an unknown emf epsilon is balanced at 600 cm of this wire , calculate the potential gradient of the potentiometer wire.

A cell of e.m.f. 4 V and of negligible internal resistance is connected in series with a potentiometer wire of length 400 cm. The e.m.f. of a Leelanche cell is found to be balacned at 150 cm from the positive end of the potentiometer wire. What is the e.m.f. of the Leclanche cell ?