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Phy 121 - Sample Ex3a

Phy 121 - Sample Ex3a - Phys 121 Exam 3 j =(ne vd j = i/A V...

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Phys 121 Exam 3 __________________________________________________________________________________________ j = (ne) v d j = i/A V = iR P = iV P = i 2 R = V 2 /R series: R eq = R 1 + R 2 +..R n parallel: R eq = (1/R 1 +1/R 2 +..1/R n ) -1 RC-circuit: charging: Q = Q (1-e -t/RC ), V C = V (1-e -t/RC ), i = i 0 (e -t/RC ), V R = i 0 R (e -t/RC ), discharging: Q = Q 0 e -t/RC , i = i 0 (e -t/RC ), V c = V 0 (e -t/RC ), V R = i 0 R (e -t/RC ), F m = q v x B F e = q E F m = i L x B v = E/B qΔ =K f -K I K=½mv 2 qvB = mv 2 /R R=mv/qB τ = μ x B μ = NiA B wire, out = μ 0 i/2 π R B wire, in = ( μ 0 i/2 π R 2 )r B arc = μ 0 i θ /4 π R B loop = μ 0 i/2R B solenoid = μ 0 in Flux: Φ = B A emf = -d Φ /dt emf = ( Φ 2 - Φ 1 )/ t emf mot = BLv emf max = NAB ϖ μ 0 = 1.26x10 -6 Tm/A e = 1.6x10 -19 C m e = 9.11x10 -31 kg 1 Two identical batteries of emf E=3V and internal resistance r=0.4- are connected in parallel then connected in series with R=2- resistor. The current in the 2- resistor is: A) 1.36 A B) 1.85 A C) 2.13 A D) 2.95 A E) 3.71 A 2. The power dissipated in the 2- resistor (in problem 2) is
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