PHYSICS 1E03 Study Guide - Final Guide: Gaussian Surface, Electric Field, Electric Potential
11 Dec 2013
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Insulator: can be charged by rubbing but charges. Conductors: (some) charges move freely (ie. metals, some liquids) Semiconductors: electrical properties are between insulators and conductors (ie. si, ge) r mn. **where r hat is a unit vector parallel to r** q q r x. When one q is doubled and one is halved, the angle does not change. If the masses were to change, the angle would too. The source q produces an electric field that pushes test charge q0. Lambda is linear charge density (charge per length of the object). Set q equal to lambda dx, you know that lambda and k are constant so they get removed from the integral. Integrate 1/x2, then plug in d and d+l. (keep in mind b-a for integrals)** In this example, be sure to consider the force between q3 and q4 (ie, watch the diagonal force as well).
