In order to figure out if you have bought real gold you decide to verify the electrical properties of a bar of gold. Which resistances would you expect in the three main directions? Dimensions are 10 cm, 25 cm and 5 cm.
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Q: Resistance
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In order to figure out if you have bought real gold you decide to verify the electrical properties of a bar of gold. Which resistances would you expect in the three main directions? Dimensions are 10 cm, 25 cm and 5 cm.
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- A coil of wire has a resistance of 36.2Ω at 26 °C and 61.7Ω at 67 °C. What is the temperature coefficient of resistivity?A copper wire that is 2.70 mm in radius with density 8.94 g/cm3 has a current of 6.10 A. The molar mass of copper is 63.5463 g/mol, and each copper atom contributes one free electron. What is the drift speed of the electrons in the copper wire?A 30.0 m long extension cord is made from two #19 gauge copper wires. (a) What is the resistance of the wire at 200C? The diameter of the copper wire is 0.912 mm.(b) If the copper wire is replaced by an Aluminium wire of the same length, what is the diameter so that the new wire has a resistance no greater than the old?
- Pure copper has a resistivity of 1.68 × 10−8 Ωm. Some accurate cubes of copper are prepared,and electrical measurements are made, for which current is passed across a pair of oppositefaces.a) Comparing a 2.5 cm cube and a 5 cm cube, which will have the higher conductance? Explain your answer.b) Given eight 1 cm cubes, how can they be stacked to get the highest and the lowest resistance between opposite faces of the stack? Calculate the resistance of each stack.There is a potential difference of 0.90 V between the ends of a 20 cm long graphite rod that has a cross-sectional area of 1.8 mm2. The resistivity of graphite is 7.5 x 10-6 2-m. (a) Find the resistance of the rod. (b) Find the current. (c) Find the electric field inside the rod.Aluminum and copper wires of equal length are found to have the same resistance. What is the ratio of their radii? Note: You need to use the concept of resistivity and find the resistivity of these two materials to solve this problem. You can find a table of resistivity in your textbook or use the internet.
- Gold is the most ductile of all metals. For example, 2 gram of gold can be drawn into a wire 2.4 km long. The density of gold is 19.3 x 103 kg/m3, and its resistivity is 2.44 x 10-8 Vm. What is the resistance of such a wire at 20.0°C? 2984 Ohms 1356 Ohms 1356250 Ohms 565OhmsPlease need the correct answer to the given question.In a physics project, you need a wire to electrically heat a cryostat. You decide to create one with materials you have lying around. You find a 29.0-g piece of copper. The resistivity of copper is 1.68 x 10-8 Ω.m, and its density is 8.9 g/cm3. You will need to use all of your copper to create a solid cylindrical wire that has a total resistance of 0.75 Ω.Determine how long your wire will be, and what its diameter will be.
- What current flows through a 2.74 cm diameter rod of pure silicon that is 25.0 cm long, when 1000 V is applied to it? (Such a rod may be used to make nuclear particle detectors, for example.) The resistivity of pure silicon is 2.30 103 Ω · m. _____AHarron has a 60 cm long wire made of gold. He sodders it to a 60 cm silver wire. If both wires have a diameter of 2mm, help Harron figure out the equivalent resistance of the combination between the free ends (A and B). A 40.0 cm B