why does the resistance of a metal vary with its temperature

Expert Solution

genius_generous answered 2 years ago

As the temperature of a metal rod varies, so does the resistance and the dimensions of...

As the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. If a copper rod has a resistance of 4.78 Ω at 20.0°C, determine the resistance of the rod (in Ω) at 120°C by accounting for the changes in both the resistivity and the dimensions of the rod. The coefficient of linear expansion for copper is 1.67 ✕ 10−5 (°C)−1 and the temperature coefficient of resistivity is 4.04 ✕ 10−3 (°C)−1.

Q1) A metal wire has a resistance of 10.0 at a temperature of 20,0 °C. If...

Q1) A metal wire has a resistance of 10.0 at a temperature of 20,0 °C. If the same wire has a resistance of 12.0 at 90.0 °C, what is the resistance of this wire when its temperature is –40.0 °C? Q2) A parallel-plate capacitor filled with air carries a charge Q. The battery is disconnected, and a slab of material with dielectric constant k = 2 is inserted between the plates. Which of the following statements is true?

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Tin (Sn) metal is a superconductor with a transition temperature of 3.7 K. Its properties are...

Tin (Sn) metal is a superconductor with a transition temperature of 3.7 K. Its properties are well described by the BCS theory. a. What is the zero temperature energy gap (in eV, not J) of Sn? b. The energy gap is the minimum energy required to break apart the Cooper pairs in a superconductor. If the breaking is done by photons what is the longest wavelength photons that can break the pairs? What is the frequency of those photons? 1...

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Ant on a metal plate. The temperature at a point ( x, y) on a metal plate is T(x, y) = 4x2 - 4xy + y2 . An ant on the plate walks around the circle of radius 10 centered at the origin. a) What are the highest and lowest temperatures encountered by the ant? b) Suppose the ant has changed its trajectory and is walking around the circle of radius 5. Is the highest temperature encountered by the ant...

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