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Unformatted text preview: 2 Electric current i = R ~ J · ˆ ndA, ~ J = q + n + v D + + q-n-v D-= σ ~ E, σ = 1 /ρ , ρ = m ne 2 τ Resistance : V = iR, R = ρL A , in series R eq = R 1 + R 2 , in parallel 1 R eq = 1 R 1 + 1 R 2 Kirchhoﬀ’s rules : (1) at a junction, current in equals current out, (2) sum of voltage rises around a loop equals zero. RC Circuits : E , switch, R , and C in series. Charge in capacitor q ( t ) , q ( t ) = C E ² 1-e-t/τ ³ + q ( t = 0) e-t/τ , τ = RC, i ( t ) = dq dt Magnetic ﬁelds and forces : I ~ B · d ~ A = 0 , F = q~v × ~ B, ~ F = Z i ~ ds × B, ~μ = IA ˆ n, ~ τ = μ × ~ B....
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This note was uploaded on 01/08/2012 for the course PHYSICS 207 taught by Professor Huerta during the Fall '11 term at University of Miami.
- Fall '11
- Electric Fields