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 2 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?

Q1/50 grams of an unknown metal at a temperature of 100 ºC is placed in a...

Q1/50 grams of an unknown metal at a temperature of 100 ºC is placed in a calorimeter that holds 25.0 grams of cold water (10 ºC). After 10 minutes, the temperature of the mixture stabilizes at 24 ºC. What is the specific heat capacity of the unknown metal? (Specific heat of water is 4.184 J  g 1  C1 ) a. 0.496 J d. 0.335 J b. 0.421 J e. 0.689 J c. 0.385 J the answer is B...

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