Question

Which of the following has a negative temperature coefficient?
A. C
B. Fe
C. Mn
D. Ag

Answer 1

 Hint: If the variation in the temperature takes place in the object, generally the materials used in the semiconductors shows the negative temperature coefficient

 Complete step by step answer:

The properties of the material changes with the variation in the temperature of the material and different material may show different changes in their properties with the temperature variation. The resistance in the flow of current through the conductive material is one of the properties which can change due to temperature variation. If decrement in the resistance of the material occurs due to an increase in the temperature, then the material has a negative temperature coefficient. But the resistance increases due to the increase in temperature then the material has a positive temperature coefficient.

Generally, if the temperature of the material that is used in the conductor's increases then the current flow in the material gets reduced due to increase in resistance, so due to this, they show the positive temperature coefficient. But if the temperature of the material that is used in the semiconductor's increases then the current flow in the material gets increased due to decrease in resistance, so due to this, they show the negative temperature coefficient.

So, the correct answer is “Option A”.

Note:
Fe, Mn and Ag are considered as metals, and the conductivity of the metals are generally good. The metal resistance increases with the increases in the temperature due to the good conductivity.