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PHY2054:Exam 2 Tuesday 11/8, 8:20-10:10PM
You must bring pencils and erasors, a calculator and your UF ID You are allowed a one page formula sheet. No hats please. No electronic communication things, Wi-Fi, cell phones or computers. A-C WM 100 D-G Weil 270 H-L LIT 101 M-P LIT 109 Q-T MccAG186 U-Z LIT 113
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Review Exam 2 Coverage: Ch. 18-23.5
Skip 18.8, 19.10, and 18: DC circuits, Kirchhoff’s rules 19: Magnetism 20: Faraday’s law 21: Electromagnetic waves 22: Reflection and refraction of light 23: Mirrors.
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PHY2054:exam 2 Look at problems from old exams.
Exam 2 in most cases but for Chapter 23, consider final. Work in a group. Some solutions are available. Make sure that you can do the problem. Remember that a trick on a bicycle, shown by some one else, means that : It can be done. The person who shoed it can do it. You might hurt yourself on the first try.
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PHY2054: Exam 2 Chapter 18: Series : Req = R1+R2+R3 Parallel: 1/Req = 1/R1 +1/R2 + … Kirchhoff’s rules: Junctions, branches and loops Junctions- total current in = total current out Potential drop summed around a closed loop = 0 q = Q(1-exp (-t/RC))
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PHY2054: exam 2 Calculate the equivalent resistance
Show that the résistance between points a and b is 12/27Ω. (apply a battery)
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PHY2054:Exam 2 The current in series is the same, the voltages add up
In parallel resistors, the potential drop is the same and the currents add. In RC circuits q(t) = Q[1 – exp(-t/RC)] Fig. P18-47, p. 623
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PHY2054:exam 2 Magnetism: F = qvxB r = mv/qB F = l IxB
τ = NIAB sin θ what is θ? Wire B = μoI/2πr Loop B = μoI/2r Solenoid B = nμoI Force between two wires F = l μoI1I2/2πd Figure 18.16 (a) A capacitor in series with a resistor, a battery, and a switch. (b) A plot of the charge on the capacitor versus time after the switch on the circuit is closed. After one time constant τ, the charge is 63% of the maximum value, Cε. The charge approaches its maximum value as t approaches infinity. Fig , p. 607
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PHY2054: exam 2 Φ = BA cos θ 𝓮 = -Δφ/Δt
Motional emf 𝓮 = Blv (bar moving in field and on rails) Force on bar (Bl)2v/R 𝓮 = NBAw sin wt 𝓮 = L dI/dt I = V/R[1 – exp(-t/RC)] Figure 18.17 (a) A charged capacitor connected to a resistor and a switch. (b) A graph of the charge on the capacitor versus time after the switch is closed. Fig , p. 607
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PHY2054: exam 2 Chap. 21. Electromagnetic waves.
Speed 1 ft/ns. 3x108 m/s B = E/c c = fλ P = U/c total absorption I = E2/2μoc Watt/m2 Force = IA/c Doppler’s effect fo = fs (1 u/c) Fig. P18-58, p. 624
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PHY2054: Exam 2 Reflection and Refraction n sinθ = constant
sin θc = n2/n1
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PHY2054: Exam 2 Images 1/p + 1/q = 1/f f = R/2 m = - q/p
Mirror concave f >0 Image real q>0 straight, m >0 amplified |m | >1
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PHY2054: Exam 2 GOOD LUCK
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