A 3.00 m length of copper wire at 20oC has a 1.20-m-long section with diameter 1.60 mm and a 1.80-m-long section with diameter 0.80 mm. There is a current of 2.5 mA in the 1.60-mm-diameter section. (a) What is the current in the 0.80-mm-diameter section? (b) What is the magnitude of E in the 1.60-mm-diameter section? (c) What is the magnitude of E in the 0.80-mm-diameter section? (d) What is the potential difference between the ends of the 3.00 m length of wire?

A wire 3.77 m long and 6.81 mm in diameter has a resistance of 20.6 mΩ. A potential difference of 26.6 V is applied between the ends. What is the magnitude of the current density?  Current in the wire is 1291.26 A Answer isnt 11284400, 3547400000,

A copper wire has a square cross section of 6 mm on a side. The wire is 10 m long and carries a current of 3.6 A. The density of free electrons is 8.5 x 1028/m³. Find the magnitude of (a) the current density in the wire; (b) the electric field in the wire. (c) How much time is required for an electron to travel the length of the wire? (p, electrical resistivity, is 1.72 x 10³ m.)

this problems is giving me hard time

An electrical conductor designed to carry large currents has a circular cross section with 2.8 mm in diameter and is 19 m long. The resistance between its ends is 0.8 2. (a) What is the resistivity (in nom or 10-9m) of the material? (b) If the electric field magnitude E in the conductor is 2.76 V/m, what is the total current (in Amps)? (c) If the material has 8.5x1028 free electrons per cubic meter, find the average drift speed (in m/s) under the conditions of part (b).

A motorcyclist is making an electric vest that, when connected to the motorcycle's 12 V battery, will warm her on cold rides. She is using 0.25-mm-diameter copper wire, and she wants a current of 3.5 A in the wire. What length wire must she use?Express your answer with the appropriate units.

Problem 1. A 50.0 m long Aluminum wire has a diameter of 0.50 mm and is at 20.0°C. If it carries a current of 0.50 mA, (a) calculate the power delivered to it? (b) If the temperature is increased to 340°C and the potential difference across the wire remains constant, what is the power delivered?

Whale and Kanmuro are two islands located in the Chimera archipelago. These two are separated by a distance of 20 miles. A power link is to be established between them. The power link delivers a maximum power of 600 MW at full capacity with an operating voltage of 500 kV. Solve for the resistivity of the cable, assuming a conductor diameter of 1.5 cm. Express your answer in p0-m.

An aluminium wire of diameter 0.24 cm is connected in series to a copper wire of diameter 0.16 cm. The wires carry an electric current of 10 A. Determine the current density in aluminium wire.