Which of the following material has nearly zero temperature coefficient of resistance?

Manganin
Porcelain
Carbon
Copper

The correct answer is A. Manganin.

Manganin is an alloy of copper, manganese, and nickel. It has a very low temperature coefficient of resistance, which means that its resistance changes very little with changes in temperature. This makes it a good material for use in electrical resistance wire, such as in rheostats and potentiometers.

Porcelain is a ceramic material made from clay and other minerals. It has a high temperature coefficient of resistance, which means that its resistance changes a lot with changes in temperature. This makes it a poor material for use in electrical resistance wire.

Carbon is a non-metallic element. It has a high temperature coefficient of resistance, which means that its resistance changes a lot with changes in temperature. This makes it a poor material for use in electrical resistance wire.

Copper is a metallic element. It has a low temperature coefficient of resistance, which means that its resistance changes very little with changes in temperature. This makes it a good material for use in electrical wiring and other applications where a stable resistance is important.

In conclusion, the correct answer is A. Manganin.

Exit mobile version