A CONDUCTING WIRE OF CROSS-SECTION 0.1 MM^2 CARRIES A CURRENT OF 5A PRODUCED BY AN ELECTRIC FIELD AT 100 V/M.THE CONDUCTIVITY OF THE MATERIAL Is
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Q: Resistivity (A-m) 2.65 x 10 Material Aluminum Соpper Gold Iron | 1.68 x 10 244 x 10 9.71 x 10…
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- A certain metal has a resistivity of 13.6×108 m at 20°C. the temperature coefficient of the given material is 0.00392°C, what will be the resistivity at 850°C.A metal wire of cross-sectional area 2.00x10-6 m² and length 4.0 m has a current of 25.0 A uniformly distributed across that area. If the conductivity of the metal is, 5.9x107 (.m)-!, calculate the magnitude of the electric field, in V/m, along the wire?Earth’s lower atmosphere contains negative and positive ions that are produced by radioactive elements in the soil and cosmic rays from space. In a certain region, the atmospheric electric field strength is 120 V/m and the field is directed vertically down.This field causes singly charged positive ions, at a density of 620 cm3, to drift downward and singly charged negative ions, at a density of 550 cm3, to drift upward. The measured conductivity of the air in that region is 2.70 * 10-14 (ohmm)-1. Calculate (a) the magnitude of the current density and (b) the ion drift speed, assumed to be the same for positive and negative ions.
- The molar conductivity of Na1 ions in aqueous solution at 25°C has been determined to be =.01 × 10-2 (V cm)-1 mol-1L. Assume an electric field of 1.0 × 102 V cm-1 is applied to the solution. Calculate the mobility and the drift velocity of Na1 ions.A block in the shape of a rectangular solid has a cross-sectional area of 4.00 cm^2 across its width, a front-to-rear length of 5.00 cm, and a material conductivity of 10^6 Ω x m^-1. The block’s material contains 5.00x10^22 conduction electrons/m^3. A potential difference of 35.0 V is maintained between its front and rear faces. Find: (a) the resistivity of the block material(b) the resistance of the block(c) the current through the block(d) the magnitude of the current density if it is uniform(e) the drift velocity of the conduction electrons (f) the magnitude of the electric field through the blockA wire with a radius of 2.22mm is made of a conducting material that has an atomic mass of 72.0 grams/mole and a mass density of 6.17x103 kg/m3. You can assume that each atom of the material has one free electron associated with it. What is the drift speed vd in a 19.3 cm long section of wire that is carrying 664 Amps? Assume 3 significant digits and units of mm/s.
- A close analogy exists between the flow of energy by heat because of a temperature difference (see Section 19.6) and the flow of electric charge because of a potential difference. In a metal, energy dQ and electrical charge dq are both transported by free electrons. Consequently, a good electri- cal conductor is usually a good thermal conductor as well. Consider a thin conducting slab of thickness dx, area A, and electrical conductivity ơ, with a potential difference dV between opposite faces. (a) Show that the current I = dq/dt is given by the equation on the left: Charge conduction Thermal conduction dq = oA dt dT kA dt dQ AP dx dx In the analogous thermal conduction equation on the right (Eq. 19.17), the rate dQ/dt of energy flow by heat (in SI units of joules per second) is due to a temperature gradient dT/dx in a material of thermal conductivity k. (b) State anal- ogous rules relating the direction of the electric current to the change in potential and relating the direction of…a current 2A flows in a copper wire over a length of 3 km and 1,1 mm.known copper conductivity is 5.8×10^7 A/V defined the voltage drop in the missing wires and electrical chargeA wire of diameter 2 mm and conductivity 5x (10) ^7 S/m if an electric field of 4 mV/m is applied. Determine the current in the wire
- Iron has a resistivity of 9.71×108 m at 20°C. What will the resistivity of Lead when then temperature is increased to 135°C. (Take a as 6.51×10³)Earth's lower atmosphere contains negative and positive ions that are produced by radioactive elements in the soil and cosmic rays from space. In a certain region, the atmospheric electric field strength is 174 V/m and the field is directed vertically down. This field causes singly charged positive ions, at a density of 868 cm³, to drift downward and singly charged negative ions, at a density of 624 cm3, to drift upward (see the figure). The measured conductivity of the air in that region is 3.45 x 10-14 (0-m)-¹. Calculate (a) the magnitude of the current density and (b) the ion drift speed, assumed to be the same for positive and negative ions. (a) Number i (b) Number Units UnitsA wire with a radius of 7.72mm is made of a conducting material that has an atomic mass of 49.4 grams/mole and a mass density of 7.78x10³ kg/m³. You can assume that each atom of the material has one free electron associated with it. What is the drift velocity in a 17.6 cm long section of wire that is carrying 704 Amps? Assume 3 significant digits and units of mm/s. Watch out for units!
