Physics 2102 Gabriela Gonz lez Physics 2102 Exam 2 review session Exam stress doesn t help Look up strategies for managing exam stress Some advice Mild low C revisit homework sets revisit your quizzes read chapter summaries read formula sheet Sleep well and save some time to relax before the exam PHYS 2102 Medium C read class slides revisit class problems do all checkpoints solve 1 2 questions read all problems solve a few old exams PHYS 2102 Hot B read whole chapters solve all questions solve 1 2 problems solve many old exams Tabasco hot A solve ALL problems invent new problems solve all old exams PHYS 2102 PHYS 2102 2 What are we going to learn A road map Electric charge Electric force on other electric charges Electric field and electric potential Moving electric charges current Electronic circuit components batteries resistors capacitors Electric currents Magnetic field Magnetic force on moving charges Time varying magnetic field Electric Field More circuit components inductors All together Maxwell s equations Electromagnetic waves Optical images Matter waves Exam 2 Ch 26 Current and Resistance current current density and drift velocity resistance and resistivity Ohm s law Ch 27 Circuits emf devices loop and junction rules resistances in series and parallel DC single and multiloop circuits power RC circuits Ch 28 Magnetic Forces magnetic and electric forces on a point charge magnetic force on a current carrying wire magnetic torque on a magnetic dipole Ch 29 Magnetic Fields due to Currents Biot Savart s law and Ampere s law forces between currents solenoids magnetic dipoles Ch 30 1 5 Induction and Inductance Faradays law Lenz s law Current and resistance i dq dt J nevd R rL A r r0 1 a T T0 Circuits V iR P iV Loop rule Single loop Junction rule Multiloop Resistors in series and in parallel Resistors Key formula V iR Capacitors Q CV In series same current Req Rj same charge 1 Ceq 1 Cj In parallel same voltage 1 Req 1 Rj same voltage Ceq Cj q t CE 1 e t RC RC circuits q t q0e t RC dq i t i0e t RC dt Time constant t RC Charge is 63 of final charge or 37 of initial charge VC t q t C VR t i t R Magnetic Fields Magnetic fields are created by magnetic materials or by electric currents Magnetic field lines always closed Magnetic fields created by currents wires loops solenoids Biot Savart s law Ampere s law Magnetic dipoles field produced by a dipole 0 idl r dB 4 r 3 B dl 0 I C Magnetic forces and torques mv v r r r r r qB F F qE q v B dF i dL B r r r t m B r r U mgB F i L B L Induced fields Changing magnetic flux creates an induced electric field and a current if there is a wire Faraday s law d B E dl dt C Formula sheet I Formula sheet II
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