6-43. Figure 6-25(a) shows two anti-parallel, infinite length strips of width w and vertical separation d. Find the force per unit length between strips. (a) Figure 6-25. Anti-parallel current-carrying strips (a) in the same plane (b) in parallel planes.

What must be the magnitude of a uniform electric field if it is to have the same energy density as that possessed by a 0.50 Tmagnetic field? (V/m)

A cylindric mica insulator to be used between a 100 kV DC line and ground has a diameter of 5 cm. The insulator is expected to prevent currents of more than 1 nA^1 . Find the minimum required length of the porcelain cylinder.

Two insulated current-carrying straight wires of equal length are arranged in the lab so that Wire A carries a current northward and Wire B carries a current eastward, the wires crossing at their midpoints separated only by their insulation. Which of the following statements are true?

A spherical surfaces r= 3 m and r=5 m are perfectly conducting and the total current passing radially outward through the medium between the two surfaces is (3 A) dc calculate: a) The voltage and the resistance between the spheres and (E) in the region between them, if a conducting material has o = 0.05 $/m is present for 3

(5) Current is flowing through a cylindrical copper wire with radius 6.33mm and length 92.1cm. This wire is hooked up to two capacitors in series C1 The capacitors both have cross sectional areas of A = 179cm2. (a) At a given moment in time, the current is I electrons is vd = 9.42µF and C2 = 8.11µF. = 77.97A and the drift velocity of the 45.6µm/s. What is the number density of electrons in this wire? (b) At a given moment in time, the charge on capacitor 2 is 62.6µC. What is the total change in potential across both capacitors combined? | (c) At the moment described in part (b), what is the energy stored in capacitor 2? (d) At the moment described in part (b), what is the energy density of the electric field in capacitor 2? :

Lets say the following electric currents flow into a junction of wires: 6.6 A (amperes or amps), -2.2 A, 6.7 A,  and last but not necessarily least 9.2 A.   What current in A flows out of that very busy junction?

Given a current J = 0.5r-¹e-10¹t A/m², determine p、(r, t) by integrating V J (making sure på → 0 as t → ∞o).