With an increase in temperature,the resistivi | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The resistivity of a material depends on the temperature coefficient of resistance,denoted by $\alpha$.For conductors,the value of $\alpha$ is pos

Vedclass · Accepted Answer

increases,decreases

Vedclass · Answer

(C) The resistivity of a material depends on the temperature coefficient of resistance,denoted by $\alpha$.For conductors,the value of $\alpha$ is positive. As temperature increases,the collision frequency of electrons with the lattice increases,leading to an increase in resistivity.For semiconductors,the value of $\alpha$ is negative. As temperature increases,more charge carriers (electrons and holes) are generated due to the breaking of covalent bonds,which significantly increases conductivity and thus decreases resistivity.Therefore,with an increase in temperature,the resistivity of a conductor increases and that of a semiconductor decreases.

With an increase in temperature,the resistivity of a conductor ........ and the resistivity of a semiconductor ....... .

Similar Questions

What is the resistivity of a perfect conductor?

The resistance of a conductor increases with:

Two square metal plates $A$ and $B$ are of the same thickness and material. The side of $B$ is twice that of $A$. These are connected as shown in series. If the resistances of $A$ and $B$ are denoted by $R_A$ and $R_B,$ then $(R_A/R_B)$ is

$A$ wire of resistance $5 \Omega$ is stretched so that its new length is $3$ times its original length. What is the resistance of the new wire?

Resistance of a wire at $0^{\circ} C, 100^{\circ} C$ and $t^{\circ} C$ is found to be $10 \Omega, 10.2 \Omega$ and $10.95 \Omega$ respectively. The temperature $t$ in Kelvin scale is $\qquad$

Vedclass Test Series

Exam Paper Generator

Online Exam Module