Physics 2102 Gabriela González Exam stress doesn’t help!! Look up strategies for managing exam stress.2 Some advice Mild (~low C): – revisit homework sets; – revisit your quizzes; – read chapter summaries; – read formula sheet PHYS 2102 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 PHYS 2102 Tabasco hot (~A!): solve ALL problems, invent new problems solve all old exams• 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 wavesi = dq/dt ρ = ρ0(1+α(T-T0)) R = ρL/A J=nevdSingle loop Multiloop V = iR P = iV Loop rule Junction ruleResistors Capacitors Key formula: V=iR Q=CV In series: same current same charge Req=∑Rj 1/Ceq= ∑1/Cj In parallel: same voltage same voltage 1/Req= ∑1/Rj Ceq=∑CjTime constant: τ=RC Charge is 63% of final charge, or 37% of initial charge VC(t)=q(t)/C; VR(t)=i(t)R• 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 dipoleL v FChanging magnetic flux creates an induced electric field (and a current if there is a wire!): Faraday’s lawFormula sheet – IFormula sheet -
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