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  4. Figure (a) and figure (b) both are showing the variation of resistivity (ρ) with temperature (T) for some materials. Identify the type of these materials.

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Q. Figure $(a)$ and figure $(b)$ both are showing the variation of resistivity $(\rho)$ with temperature $(T)$ for some materials. Identify the type of these materials.Physics Question Image

Current Electricity

Solution:

Due to Temperature increase number of free electron increase and its amount goes larger then they start to resist motion of each other therefore Resistance of the conductor will increase (Graph-2) For Semiconductor: Number of free electron is very less. Due to temperature increase, number of free electron increase that electron act as a carrier therefore resistance of the conductor decrease.