Asphere with radius r is centered at the origin, an infinite cylinder with radius r has it axis along the z-axis, and an infinite slab with thickness 2r lies between the planes z=âr and z=r. the uniform charge volume densities of these objects are ïsph, ïcyl, and ïslab respectively. the objects are superposed on top of each other; the densities add where the objects overlap. how should the three densities be related so that the electric field is zero everywhere throughout the volume of the sphere?

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?