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CU-Boulder PHYS 1120 - Post Exam 3 Review

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RF-1Phys1120 Post Exam 3 Review:Inductors ML IF = (Definition of L)d ILd t= -E (from ML IF =, Md d ILd t d tF= + Faraday's Law)LR circuits:- I thru L cannot change instantly- In steady state, I = constant, VL = 0 so L acts like a short.- time constant - = L/RMagnetic energy density = 2MM0U 1u Bvol 2m= =Magnetic energy of inductor = 21U L I2=AC CircuitsV(t) = Vpeak sin(-t), peak2rmsVV V2= =All the DC voltage formulas V = I R, P = I V = I2 / R = V2 / R work OK with Irms, Vrms, and PavgTransformers only work for AC voltages only out S Sin P PV V NV V N= =Pout = Pin - IS VS = IP VP - SP PP S SIV NI V N= =EM Waves- Light is an electromagnetic wave which is created by accelerating electric charge.- Know what a plane wave is.- f c speed of light = constantl = =, EM spectrum (radio, visible, IR, UV, etc)- 2power Pintensity (W/m ) = , Iarea A=Phys1120 Notes, Dubson ©University of Colorado at BoulderRF-2Phys1120 Notes, Dubson ©University of Colorado at BoulderRF-3Ray Optics- Snell's Law: 1 1 2 2n sin n sinq = q , where index of refraction = cnv=- total internal reflection, critical angle -C : o1 c 2 21n sin n sin(90 ) nq = =144424443- Converging and diverging lenses , focal length- Ray diagrams, image formation, real vs. virtual images- Camera vs. eye- image/object math: o i1 1 1f d d= + , i io oh dMh d� =Phys1120 Notes, Dubson ©University of Colorado at Boulderf > 0f < 0RF-4Are you ready for the Final Exam? If so, you should know and understand.- The definition of the electric field.- The definition of the magnetic field.- Coulomb's Law.- The E-field due to a point charge and how to derive it.- Gauss's Law.- The definition of electric flux and magnetic flux.- The definition of voltage difference.- Voltage due to a point charge and how to derive it.- The definition of capacitance.- Kirchhoff's Laws for circuits (voltage law and current law)- The Biot-Savart Law.- Gauss's Law for B-fields.- Faraday's Law.- The definition of inductance.- Snell's Law.You should invent a problem in which you use To prepare for any exam:- Study the online lecture Notes.- Review Concept Tests, CAPA problems, and Tutorial HW. (Read question and try to remember reasoning that gets to the answer)- Prepare your formula sheet. Prioritize: which are the important equations?- Take the practice exam.- It is no good to memorize answers. You have to understand and remember how you got the answers.Phys1120 Notes, Dubson ©University of Colorado at


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CU-Boulder PHYS 1120 - Post Exam 3 Review

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