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?

Expert Solution

genius_generous answered 3 years ago

A given copper wire has a resistance of 5.10 ? at 20.0°C while a tungsten wire...

A given copper wire has a resistance of 5.10 ? at 20.0°C while a tungsten wire of the same diameter has a resistance of 4.67 ? at 20.0°C. At what temperature will the two wires have the same resistance?

why does the resistance of a metal vary with its temperature

The resistance R of a tungsten wire as a function of temperature can be modeled with...

The resistance R of a tungsten wire as a function of temperature can be modeled with the equation R=R0*[1+α(T-T0 ) whereR0 is the resistance corresponding to temperature T0, and α is the temperaturecoefficient of resistance. Determine R0and α such that the equation will best fit the following data (Use linear regression curve fitting). Take T0 = 20°C. T=[20 100 180 260 340 420 500] R=[500 676 870 1060 1205 1410 1565] After enter below codes it gives an error function...

Current through a heated metal wire A 39.5 m long copper wire at a temperature of...

Current through a heated metal wire A 39.5 m long copper wire at a temperature of 22.9 oC has a radius of 0.275 mm. If a potential difference of 11.8 V is applied across the length of the wire, determine the current in the wire. If the wire is heated to 90.6 oC and the 11.8 V potential difference is maintained, what is the resulting current in the wire?

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.

6. A long, straight wire has a 10.0-

A 2.60-N metal bar, 0.850m long and having a resistance of 10.0?, rests horizontally on...

A 2.60-N metal bar, 0.850m long and having a resistance of 10.0? , rests horizontally on conducting wires connecting it to the circuit shown in (Figure 1) . The bar is in a uniform, horizontal, 1.60-T magnetic field and is not attached to the wires in the circuit.What is the acceleration of the bar just after the switchS is closed?

What is the resistance of a nichrome wire at 0.0 degrees C if its resistance 100.00 ohms at 11.5 degrees C?

a)What is the resistance of a nichrome wire at 0.0 degrees C if its resistance 100.00 ohms at 11.5 degrees C? (b)What is the resistance of a carbon rod at 25.8 degrees C if its resistance is 0.0160 ohms at 0.0 degrees C?

It is necessary to double the length of a wire, but the resistance of the wire...

It is necessary to double the length of a wire, but the resistance of the wire needs to remain APPROXIMATELY the same. If the wire is initially 22 gauge, what gauge of wire should be used to accomplish this?

A 3.10-N metal bar, 2.00 m long and having a resistance of 10.0 Ω, rests horizontally...

A 3.10-N metal bar, 2.00 m long and having a resistance of 10.0 Ω, rests horizontally on conducting wires connecting it to the circuit shown in the figure (Figure 1) . The bar is in a uniform, horizontal, 1.40-T magnetic field and is not attached to the wires in the circuit. What is the magnitude of the acceleration of the bar just after the switch S is closed? file:///Users/barkleydiann/Desktop/YF-27-68.jpg

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