Temperature Dependence of Resistivity

The conductivity of a material varies with temperature for (i) semiconductors and (ii) good conductors as

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils.

Reason R: Constantan and manganin have very small value of temperature coefficient of resistance.

In the light of the above statements, choose the correct answer from the options given below.

Resistance of the wire is measured as $2 \mathrm{\Omega }$ and $3 \mathrm{\Omega }$ at $10°\mathrm{C}$ and $30°\mathrm{C}$ respectively. Temperature coefficient of resistance of the material of the wire is

How resistivity varies with temperature for semiconductor insulator and conductor?

Do insulators have resistivity?

What is the effect of temperature on the resistivity of a conductor?

How does resistivity of insulators relate to temperature?

The positive temperature coefficient of resistance is for;

Give an example of a material each for which temperature coefficient of resistivity is (1) positive (2) Negative

Why temperature coefficient of resistance of conductor is positive?

The temperature dependence of resistance of $\mathrm{Cu}$ and undoped $\mathrm{Si}$ in the temperature range $300-400 \mathrm{K}$ is best described by

The temperature coefficient of resistance of a wire is $0.00125 /°\mathrm{C}$ . At $300 \mathrm{K}$, its resistance is $1 \mathrm{\Omega }$. The resistance of wire will be $2 \mathrm{\Omega }$ at

Two conductors have the same resistance at $0°\mathrm{C}$ but their temperature coefficients of resistance are ${\alpha }_1$ and ${\alpha }_2.$ The respective temperature coefficients of their series and parallel combinations are nearly

Four identical copper cylinders are painted. If they are all heated to the same temperature and left in vacuum, which will cool most rapidly?

Consider the statements A and B in the previous question. Peltier effect is caused

A conducting resistance is connected to a battery. The temperature of the conductor decreases due to cooling. The current flowing through the resistance will -

Select the wrong option from the following:

Nichrome or Manganin are widely used in a rheostat because of their,

Find the temperature coefficient of resistance of material of the wire having a resistance of $2.5\mathrm{ }\mathrm{\Omega }$ at $28 °\mathrm{C}$ and a resistance of $2.9\mathrm{ }\mathrm{\Omega }$ at $100 °\mathrm{C}$ .

Temperature coefficient of resistance is $\mathrm{\alpha }=1.70\times {10}^{-4} °{\mathrm{C}}^{-1}$ and have a resistance of $65\mathrm{ }\mathrm{\Omega }$ at room temperature. What is the steady temperature of the wire if it is connected to a $220\mathrm{ }\mathrm{V}$ supply the current settles after a few second to $2.8\mathrm{ }\mathrm{A}$.