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Unformatted text preview: , A r = area vector, equal to area, pointing perpendicular to area; > E- outflux; < E- influx For uniform field: A E E r r = ; For enclosed charge Q: Q E = Capacitors: Q = C V; Energy: U = Q 2 /C = C V 2 = Q V; Capacitance of a plate capacitor: C = K e A/d Resistors: R = R 1 + R 2 + . .. in series, ... 1 1 1 2 1 + + = R R R in parallel; V = R I; R = r L/A Trigonometry review: ) /( ) ( ) ( ), /( ) ( ) ( ), /( ) ( ) ( adj opp Tan hyp adj Cos hyp opp Sin = = = Pythagorean theorem: (hyp) 2 = (opp) 2 + (adj) 2 Vectors: A or A r and components ( x A , y A ) A + B Nose to tail A points opposite A A B means A + (B) Component = (sign)(magnitude)(trig fn); C = A + B means x x x B A C + = and y y y B A C + = Magnitude of C = | C | = 2 2 y x C C + ; Angle to nearest x-axis: | | | | tan 1 x y C C =...
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- Spring '08