Physics 1029A/B Quiz: Electric Field and Dipole Textbook notes.docx
23 Apr 2014
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A vector field, has magnitude and direction: stationary electric field: point charges in the electric field do not move electrostatics. Only the charge of interest: probe charge: mobile charge of interest. 3 model systems: stationary point charge, electric dipole and charged parallel plates. Practical cases of a point charge and arrangement of stationary electric field. They collide with metal ions instead of gas particles. They scatter away from densely packed immobile metal ions. Electric dipole: can be considered a special case of stationary point charge, dipole moment: from electric field calculation, identifies the strength of dipoles. 2 cases of mobile particle around stationary point charges: approaching point charge, approaching dipole dipole-dipole interactions: interactions of ions in an aqueous solution. Example: when a salt dissolved in water, water dipoles attack the salt crystal and attach themselves to the released cations and anions. Slower diffusion: each ion is embedded in a hydration shell.
