Hi Rachana

Hope you are doing well

In general alloys like constantan or manganin are used as potentiometer wire .
Constantan or manganin are used as potentiometer wire because of the following two reasons which are listed below :-

• Constantan or manganin wire posses high specific resistance
• Constantan or manganin wire posses low temperature coefficient.

So , potentiometer wire is normally made of alloys constantan and manganin.

I hope that it helps you

Thankyou