A conductor has a cross-sectional area of 2.3x106 m2 and the number of free electrons per unit volume is 8.5x 1028 electron/m3. When the current is 7.5 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6x 10 19 C. Select one: O A. 31.48 О В. 0.16 OC. 0.24 OD. 0.31 E. 23.98 Next page

Answer must be in standard form scientific notation with SI units that do not have prefixes except for kg. Provide the answer with the correct amount of significant figures. Thank you so much I greatly appreciate it

A 320-km-long high-voltage transmission line 2.0 cm in diameter carries a steady current of 1,040 A. If the conductor is copper with a free charge density of 8.5  1028 electrons per cubic meter, how many years does it take one electron to travel the full length of the cable? (Use 3.156  107 for the number of seconds in a year.) yr

25.69      A 1.50-m cylinder of radius 1.10 cm is made of a complicated mixture of materials. Its resistivity depends on the distance x from the left end and obeys the formula rho(x) = a + bx2, where a and b are constants. At the left end, the resistivity is 2.25 X 10-8 Ohm-meters, while at the right end it is 8.50 X 10-8 Ohm-meters. (a) What is the resistance of this rod? (b) What is the electric field at its midpoint if it carries a 1.75-A current?

1. A certain geophysical technique determines the electrical resistivity of the ground by measuring the voltage, V, and current, I, between electrodes separated by a distance, a. These measurements are related to resistivity by the equation, resistivity = 2za (VI). 1.00 +0.01 meters, what If V = 0.512 +0.01 volts, I–0.00684 ± 0.0001 Amps, and a = is the uncertainty in the resistivity. (Note: The units of resistivity are ohm-meters. The numbers in this problem are given in such a way that no unit conversions are necessary.)

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 current of 5A passes through a wire. The number of electrons crossing a point in the wire in 2 minutes is O a. 3.745x1021 O b. 1.602x10 19 Oc 6.24x1019 O d. 0

A current is established in a gas discharge tube when a sufficiently high potential difference is applied across the two electrodes in the tube.The gas ionizes; electrons move toward the positive terminal and singly charged positive ions toward the negative terminal. (a) What is the current in a hydrogen discharge tube in which 3.1 *10^18 electrons and 1.1* 10^18 protons move past a crosssectional area of the tube each second? (b) Is the direction of the current density toward or away from the negative terminal?

A total of 2.0 × 10^13 electrons pass a given point in a wire in 15 s. What is the current in the wire? Hint: What is the total charge of this number of electrons?

A strip of doped silicon 260.0 um wide contains 8.80 x 10-2 conduction electrons per cubic meter and an insignificant number of holes. When the strip carries a current of 102 µA, the drift speed of the electrons is 59.6 cm/s. What is the thickness of the strip? Um