Physics 1302A/B Study Guide - Midterm Guide: Rc Circuit, Capacitor, Drift Velocity

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Surface charge density: =(cid:3044)(cid:3002, c = (cid:3002)(cid:3023, e = (cid:2868)a = vd, c capacitance, v volume, d distance between plates. Electric potential energy stored in a capacitor: u = w = qv = cv2 = q2/2c. If capacitor stays connected to battery, v remains constant, and the larger k is, the larger q and c are: e does not change, u becomes larger. If capacitor is disconnected from battery, q remains constant, and the larger k is, the larger c is and the smaller v is: e decreases, u decreases. Increases capacitance: ceq = c1 + c2 + c3, q = q1 + q2 + q3, same v as capacitor. Electric current: w = u = 0 e2dv, for a uniformly distributed charged sphere, electrons in a wire move randomly with speeds at 106 m/s, current arrow is the direction in which + charge carries would move. I = (cid:3031)(cid:3044)(cid:3031) = (cid:3044: a = (cid:2024)r2 for a wire.

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