RF 1 Phys1120 Post Exam 3 Review Inductors M L I E L Definition of L dI d M dI from M L I Faraday s Law L dt dt dt LR circuits I thru L cannot change instantly In steady state I constant VL 0 so L acts like a short time constant L R UM 1 2 B vol 2 0 1 Magnetic energy of inductor U L I 2 2 Magnetic energy density u M AC Circuits V t Vpeak sin t Vrms V 2 Vpeak 2 All the DC voltage formulas V I R P I V I2 R V2 R work OK with Irms Vrms and Pavg V V N Transformers only work for AC voltages only out S S Vin VP NP I VP N Pout Pin IS VS IP VP S P IP VS NS 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 constant EM spectrum radio visible IR UV etc intensity W m 2 power area Phys1120 Notes Dubson I P A University of Colorado at Boulder RF 2 Ray Optics Snell s Law n1 sin 1 n 2 sin 2 where index of refraction n c v total internal reflection critical angle C n1 sin c n 2 sin 90o n 2 1 Converging and diverging lenses focal length f 0 f 0 Ray diagrams image formation real vs virtual images Camera vs eye image object math 1 1 1 f do di Phys1120 Notes Dubson M hi d i ho do University of Colorado at Boulder RF 3 Are 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 Boulder
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