A 1.00-mm-radius, cylindrical copper wire carries a current of 8.00 A. If each copper atom in the wire contributes one free conduction electron to the current, what is the drift velocity of the electrons in the wire? Some useful information: MCu= 63.546 g/mole, Pcu = 8.96 g/cm3, and NA = 6.02 x 1023 mole-1. a. 0.304 mm/s O b.0.510 mm/s O c. 0.733 mm/s d. 0.0923 mm/s e. 0.187 mm/s

2.1 A piece of wire l cm long carries a current I when a voltage V is applied across its ends at a temperature of 0°C. If the resistivity of the material of which the wird is made varies as shown in the figure, what length of the same diameter wire is needed so that the same current flows when the same voltage is applied at temperature 400°C? 12 10 8. 2. 01 200 400 600 800 1000 Temperature ("C) Resistivity (10 2m)

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.

A copper wire of cross-sectional area 1.40 mm² has a current of 3.90 A flowing along its length. What is the drift speed of the conduction electrons? Assume 1.30 conduction electrons per copper atom. The mass density of copper is 9.00 g/cm³ and its molar mass is 64.0 g/mol. mm/s

You apply a potential difference of 3.4 V between the ends of a wire that is 3 m in length and 0.5 mm in radius. The resulting current through the wire is 12 A. What is the resistivity of the wire in nano-ohm-meter?

A copper wire has a square cross section 2.3mm on a side. The wire is 4m long and carries a current of 3.6 A. The density of the free electrons is n = 8.5 * 1029 m-3. The resistivity of Copper is 1.7 * 10-8 ohmmeter. What is the current density and the electric field inside the wire?

Shown below is a copper wire with the following characteristics: Diameter: 1.45 mm.00145m 1.45 × 10-8 m Number density of electrons: 8.47 x 1028 electrons/m³. Conductivity: 5.96 x 107 S/m a. Calculate the drift velocity (magnitude and direction) of the electrons in the wire when a current of 5.00 A is running through it. b. What direction is the current moving? c. Remembering that current density is a vector, calculate the magnitude and direction of the current density of this wire. d. Calculate the resistivity of the wire. e. Calculate the resistance of this wire if it were 10.0 m in length.

A conductor has a cross-sectional area of 2.3x106 m² and the number of free electrons per unit volume is 8.5 X1028 electron/m³. When the current is 7.1 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6×1019 c.

A wire has a current density of 6.71 × 10° A/m2. If the cross-sectional area of the wire is 1.03 mm2, what current I does the wire carry? I = A With this current, how much time t is required for 3.99 × 1020 electrons to pass any point on the wire? t = S

A wire is 1.3 m long and 0.97 mm2 in cross-sectional area. It carries a current of 5.0 A when a 1.6 V potential difference is applied between its ends. Calculate the conductivity o of the material of which this wire is made. Number Units (요·m)^-1 ▼ Use correct number of significant digits; the tolerance is +/-1 in the 2nd significant digit