Chapter 19, Problem 19.2P

A coil consists of 2000 turns of copper wire having a circular - section of diameter 2.5 mm. The mean length per turn is 80 cm and the electrical resistivity of copper is 0.02 μΩ–m. Determine the resistance of the coil.

A rod of semiconducting material of lenght L=3 m and cross-sectional area A=4.5 mm^2 lies along the x-axis between x=0 and x=L. The material obeys ohm's law, and resistivity varies along the rod according to p=p0 (1-(x^2/L^2)) where p0= 4.10^-4 ohm.m. The end of the rod x=0 is at a potential V0=30V greater than the x=L. A) what is the total resistance, in units of ohm, of the rod? B) what is the current, in units of miliamperes, in the rod?  C) what is the electric potential, in units of Volt, in the rod at x=L/2? D) what is the electic-field magnitude E, in units of V/m, in the rod at x=L/2?

Example 1.6 Solid copper wire having a diameter of 1.63 mm is used to provide electrical distribution to outlets and light sockets . Determine the resistance of 75 meters of a solid copper wire having the above diameter . Resistivity of copper at 20 C is 8 1.723 * 10-8 22.m.

Determine the length of a copper wire that has a cross-sectional area as 8.1 mm?. The resistance and the electrical resistivity of the copper wire are 14 N and 1.79 x 10-6 Qm. The length of a copper wire (in meters)

Determine the resistance of 1200 m of copper cable having a diameter of 12 mm if the resistivity of copper is 1.7 x 10^(-8) Q.m

The free charge density in copper is 1.81x1010 C/m 3 . For a current density of 8x106A/m2, solve the electric field intensity and the drift velocity.Look at the table for more information.

A 4.0-nm-diameter protein is in a 0.050 M KCl solution at 25° C. The protein has 9 positive and 20 negative charges. Model the protein as a sphere with a uniform surface charge density. Part A What is the electric potential of the protein at the surface? Express your answer with the appropriate units. μA ? Vsurface = Value Units Submit Request Answer Part B What is the electric potential of the protein 2.0 nm from the surface? Express your answer with the appropriate units. με V2 nm = Value Units Submit Request Answer

M4.25 (Sl units) What is the resistance R of a length of copper wire whose length 10 m and whose diameter 0.30 mm? Use Table 4.3 of the book for reference. Round to the nearest thousandth of an ohm ()

Determine the resistance of a copper wire that has a cross-sectional area as 8.3 mm2. The length and the electrical resistivity of the copper wire are 76.2 m and 1.62 x 10-6 Ωm. The resistance of a copper wire (in 2)