The variations of resistivity rho with absolu | vedclass

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

Question

(A) In the given graph:$1$. For material $Z$,resistivity $\rho$ decreases exponentially with an increase in temperature $T$. This is a characteristic

Vedclass · Accepted Answer

$X$ - copper,$Y$ - nichrome,$Z$ - semiconductor

Vedclass · Answer

(A) In the given graph:$1$. For material $Z$,resistivity $\rho$ decreases exponentially with an increase in temperature $T$. This is a characteristic property of semiconductors.$2$. For material $Y$,resistivity $\rho$ increases linearly with temperature $T$. This is a characteristic property of alloys like nichrome,which have a very small temperature coefficient of resistance.$3$. For material $X$,resistivity $\rho$ increases non-linearly with temperature $T$. This is a characteristic property of metals like copper.Therefore,$X$ is copper,$Y$ is nichrome,and $Z$ is a semiconductor.

The variations of resistivity $\rho$ with absolute temperature $T$ for three different materials $X, Y$ and $Z$ are shown in the graph below. Identify the materials $X, Y$ and $Z$.

Similar Questions

Draw the resistivity versus temperature $(\rho \to T)$ graph for metals, alloys, and semiconductors.

$A$ metal rod of length $10 \ cm$ and a rectangular cross-section of $1 \ cm \times 0.5 \ cm$ is connected to a battery across opposite faces. The resistance will be . . . . . . .

Two wires $A$ and $B$ are made up of the same material and have the same mass. Wire $A$ has a radius of $2.0 \ mm$ and wire $B$ has a radius of $4.0 \ mm$. The resistance of wire $B$ is $2 \ \Omega$. The resistance of wire $A$ is . . . . . . $\Omega$.

The resistances of a carbon filament lamp and a tungsten filament lamp are measured individually when the lamps are lit and compared with their respective resistances when cold. Which one of the following statements will be true?

Three bulbs of $40\,W$,$60\,W$,and $100\,W$ are connected in series with a $220\,V$ supply. Which bulb has the minimum resistance?

Vedclass Test Series

Exam Paper Generator

Online Exam Module