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

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

Of what material is a potentiometer wire normally made?

Why is a potentiometer named as potentiometer?

Explain the principle on which the working of a potentiometer is based. Why is the use of potentiometer preferred over that of a voltmeter for measuring the e.m.f. of a cell.

A cell of e.m.f. 2 V and negligible internal resistance is connected to a potentiometer wire of resistance 10 Omega and length 4 m. The potential difference per unit length (potential gradient ) of the wire is

Which material is used for making electromagnet and why?

Why plastic material like polythene is preferred over natural materials?