5. Suppose that a rain cloud is approximately spherical in shape, with radius a, and a roughly un...
A spherical shell of radius 9.0 cm carries a uniform surface charge density ơ = 9.0 nC/m2. The electric field at r = 16 cm is approximately 0.32 kN/C 1.0 kN/C zero 0.13 kN/C 0.53 kN/C
Consider a cylindrical capacitor like that shown in Fig. 24.6. Let d = rb − ra be the spacing between the inner and outer conductors. (a) Let the radii of the two conductors be only slightly different, so that d << ra. Show that the result derived in Example 24.4 (Section 24.1) for the capacitance of a cylindrical capacitor then reduces to Eq. (24.2), the equation for the capacitance of a parallel-plate capacitor, with A being the surface area of...