A wire is 1.2 m long and 1.2 mm² in cross-sectional area. It carries a current of 5.6 A when a 3.0 V potential difference is applied between its ends. Calculate the conductivity of the material of which this wire is made. Number i 1| Units (Q-m)^-1
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- A current of 1.6 A flows for 8.9 s through a conductor. Calculate the number of electrons that pass through a point in the conductor during this time. Answer format: 1.2e+20. (e+20 is same as x10^20)An electrical conductor designed to carry large currents has a circular cross section 2.40 mm in diameter and is 14.8 m long. The resistance between its ends is 0.107 2 Part A What is the resistivity of the material? ? p= Submit Request Answer Part B If the electric field magnitude in the conductor is 1.29 V/m. what is the total current? ? I = Part C If the material has 8,5 x 1025 free electrons per cubic meter, find the average drift speed under the conditions of part B. VO AE m/s Submit Reguest AnswtCurrent and Resistance Problem 18: Consider two wires made of different materials. Wire A has a conductivity of 1.9 × 107 Ω-1m-1, and wire B has a conductivity of 8.5 × 107 Ω-1m-1. Part (a) Wire A has a circular cross-section with radius 2.74 mm. If there is an electric field of 0.059 V/m inside it, how much current, in amperes, is flowing through it? Part (b) Wire B has a square 2.74 mm × 2.74 mm cross-section. If wire B has the same electric field as Wire A did in part (a), what current, in amperes, would be passing through it?
- thanks!A tungsten wire has a radius of 0.097 mm and is heated from 20.0 to 1383 oC. The temperature coefficient of resistivity is α = 4.5 x 10-3 (Co)-1. When 120 V is applied across the ends of the hot wire, a current of 1.8 A is produced. How long is the wire? Neglect any effects due to thermal expansion of the wire.28 1 6.0 x 10 m3 1. Consider a cylindrical wire that has conduction electron density and radius 0.5 mm. An electric field with strength 7.5 x 10-4 creates a current of 4.8 x 10 electrons per second. a) What is the average drift speed for an electron? (include units) b) What is the average time in between electron collisions? fs (express your answer in femtoseconds)
- Problem 7 A cylindrical platinum wire is 0.0644 mm in diameter and 1.05 m in length. The wire carries a 1.05 A current. Assume there is one free electron (q = -1.602x10-19 C) per platinum atom. Avogadro's number is 6.022x1023 atoms per mol. Platinum has a density of 21.5 g/cm³, a molar mass of 195 g/mol, and a resistivity of 10.6x10-8 Qm. (a) Find the the current density (j), in units of A/m². (b) Find the number density of free electrons (n), in units of m-3. (c) Find the drift velocity of electrons in the wire (va), in units of m/s. (d) Find the magnitude of the electric field in the wire, in units of N/C. (e) Find the potential difference across the wire, in units of Volts.A current of 44.7 mA flows in a silver wire of diameter 2.55 mm. Find the electric field strength inside the wire. The conductivity of silver is 6.25 x 10'2'm-'. electric field strength: V/mp5
- 1. A tungsten wire has a radius of 0.072 mm. When 128 V is applied across the ends of the hot wire, a current of 3.00 A is produced. How long is wire? (The resistivity of tungsten is 2.65 × : m 5 cci16 cm) ceil6 ceil6 cc(1) What is a definition of electric current? Label the variables. (2) Suppose that 1016 electrons pass through a cross-section of a wire each second. What is the current in the wire? (3) The current in a wire varies with time according to the relation / = 5+3t where I is in amperes andt is in seconds. What is the number of coulombs of charge that pass a cross section of the wire between t=3s and t=5s?Question A spool of copper wire 200 m long and with a diameter of 0.320 mm is at 20.0°C. For copper, the resistivity is 1.70 X 10-8 Q·m and the temperature coefficient of resistivity is 3.90 X 10-3 (°C)~1. (a) What is the magnitude of the electric field (in V/m) in the wire if it carries a current of 0.400 A? V/m (b) What is the electric power (in W) delivered to the spool while it carries a current of 0.400 A? W (c) What is the power (in W) delivered to the spool if the potential difference across the wire is held constant and the temperature is increased to 280°C? W