30 In Fig. 23-43, short sections of two very long parallel lines of charge are shown, fixed in place, Line 1 separated by L= 8.0 cm. The uni- form linear charge densities are +6.0 µC/m for line 1 and -2.0 µC/m for line 2. Where along the x axis shown is the net electric field from the two lines zero? Line 2 L/2 | L/2 Figure 23-43 Problem 30.

In Figure 23-35, short sections of two very long parallel lines of charge are shown, fixed in place and separated by L = 7.6 cm. The uniform linear charge densities are +6.6 µC/m for line 1 and -2.0 µC/m for line 2. Where along the x axis shown is the net electric field from the two lines zero?

(a) Determine the electric field strength at a point 1.00 cm to the left of the middle charge shown in the figure below. (Enter the magnitude of the electric field only.) 6.00 μC 1.50 μC -2.00 μC N/C 3.00 cm -2.00 cm -Select--- Ⓡ (b) If a charge of -5.41 µC is placed at this point, what are the magnitude and direction of the force on it? magnitude N direction

A solid conducting sphere of radius 2.00 cm has a charge of 7.55 µC. A conducting spherical shell of inner radius 4.00 cm and outer radius 5.00 cm is concentric with the solid sphere and has a charge of -3.45 µC. Find the electric field at the following radii from the center of this charge configuration. (a) r = 1.00 cm magnitude N/C direction ---Select--- (b) r = 3.00 cm magnitude N/C direction ---Select--- (c) r = 4.50 cm magnitude N/C direction ---Select--- (d) r = 7.00 cm magnitude N/C direction ---Select---