Which of the following materials has the highest conductivity? a) Copper b) Aluminum c) Silver d) Iron
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- The resistivity of a ferric-chromium-aluminum alloy is 51x10° ohm-meter. A sheet of the material is 15 cm long, 6 cm wide and 0.014 cm thick. Determine the resistance between a) opposite ends and b) opposite sides.Question 3 a. Some materials exhibit the property of superconductivity under certain conditions. State what is meant by superconductivity and explain the required conditions for the material to become superconducting. b. The diagram below shows the cross-section of a cable consisting of parallel filaments that can be made superconducting, embedded in a cylinder of copper. copper cylinder filament The cross-sectional area of the copper in the cable is 2.28 x 10-7 m². The resistance of the copper in a 1.0 m length of the cable is 0.075 N. Calculate the resistivity of the copper, stating an appropriate unit. State and explain the what happen to the resistance of the cable when the embedded filaments of wire are made superconductive? i.The resistance of a copper wire is 125 ohms at 100°C. Determine the resistance at 70°C
- 10) A certain batch of copper wire was found to have a conductivity of 98% at 20°C. What is its resistivity in un-cm? 11) The resistance of a copper at 30°C is 500. If the temperature coefficient of copper at 0°C is 0.00427. What is the resistance at 100°C?Ferromagnetic materials have this characteristic. A. A relative permeability slightly less than one. B. A relative permeability slightly greater than one. C. A very high resistivity. D. A high relative permeability.Which of the below material has the character if temperature increases conductivity Increases ? a. Semiconductors b. Conductors c. Insulator d. either insulator or semiconductor
- Problem 13. Some copper wire has a resistance of 200 2 at 20°C. A current is passed through the wire and the temperature rises to 90°C. Determine the resistance of the wire at 90°C, correct to the nearest ohm, assuming that the temperature coefficient of resistance is 0.004/°C at 0°C.* A material that does not normally conduct current is called semiconductor O conductor O insulator O copper O1. Given a typical tungsten filament of a light bulb, 1 m long and 0.05mm in radius. nim B. Given that the temperature resistivity coefficient of tungsten is 4.5 X 10-3/ °C, meldoig zinovovd omo A. Calculate the typical resistance of the filament given that its resistivity at 20 °C is 5.6 X 10-8 (Q -m). calculate the resistance at 2000 °C. assuming linear resistivity-temperature 2000 ert pria relation.
- 22 - Which of the following is the element formed by pressing two metals with different expansion coefficients? A) Bimetal elementB) Limit switchC) ThermistorD) ThermocoupleE) Rod and tube elementA two wires, one of Copper and the other of Nickel, if the resistance of the first is (12.7 Q), and the second is (11.6 0) at room temperature, at what temperature are their resistances equal? Note that the temperature coefficient of resistivity of Copper is (0.0039 C-1), and for Nickel it is equal to (0.006 C1).Why do some minerals, such as native gold, silver, and graphite, conduct electricity, whereas others, such as quartz and feldspar, do not?