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Problems 793 From Gauss’s law, the electric field set up by a uni- form line of charge is where is a unit vector pointing radially away from the line 1 and r # r 2 . 64. Four balls, each with mass m, are connected by four non- rˆ E # ' 1 2/6 0 r (
rˆ 63. 1 2 3 4 Figure P25.64 C B A r 1 r 2 Figure P25.66 R Q v x Uniformly charged ring Q Figure P25.67 b a L x P y Figure P25.68 a –q a +q r 1 r 2 r θ x y P E r E θ θ Figure P25.69 65. A point charge q is located at x # ! R, and a point charge 2q is located at the origin. Prove that the equipotential surface that has zero potential is a sphere centered at 66. Consider two thin, conducting, spherical shells as shown in 1 # 15.0 cm and a charge of 10.0 nC. The outer shell has a radius 2 # 30.0 cm and a charge of ! 15.0 nC. Find (a) the electric field E and (b) the electric potential V in regions A point charge Q of mass M is located initially at the center v # ' 2k e
Q 2 MR ( 1/2 An electric dipole is located along the y axis as shown V # k e
p cos ( r
2 69. 67. The x axis is the symmetry axis of a stationary uniformly 68. The thin, uniformly charged rod shown in Figure P25.68 |