Physics 2102 Jonathan Dowling Physics 2102 Exam 2 Review Session CH 25 28 Some links on exam stress http appl003 lsu edu slas cas nsf Content Stress Management Tip 1 http wso williams edu orgs peerh stress exams html http www thecalmzone net Home ExamStress php http www staithes demon co uk exams html Exam 2 Ch 26 Capacitors capacitance and capacitors caps in parallel and in series dielectrics energy field and potential in capacitors Ch 27 Current and Resistance Resistance current current density and drift velocity resistance and resistivity Ohm s law Ch 28 Circuits emf devices loop and junction rules resistances in series and parallel DC single and multiloop circuits power RC circuits Capacitors E 0 q A 0 E Vd q CV C 0A d C 0A d C 0ab b a Current and resistance i dq dt Junction rule V iR E J R L A 0 1 T T0 DC Circuits Loop rule V iR P iV Single loop Multiloop Resistors and Capacitors 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 Capacitors and Resistors in Series and in Parallel What s the equivalent resistance capacitance What s the current charge in each resistor capacitor What s the potential across each resistor capacitor What s the current charge delivered by the battery RC Circuits Time constant RC Charging q t CE 1 e t RC Discharging q t q0 e t RC i t dq dt Capacitors Checkpoints Questions Problem 25 21 When switch S is thrown to the left the plates of capacitor 1 acquire a potential V0 Capacitors 2 and 3 are initially uncharged The switch is now thrown to the right What are the final charges q1 q2 and q3 on the capacitors Current and Resistance Checkpoints Questions Problem 26 56 A cylindrical resistor of radius 5 0mm and length 2 0 cm is made of a material that has a resistivity of 3 5x10 5 m What are the a current density and b the potential difference when the energy dissipation rate in the resistor is 1 0W Circuits Checkpoints Questions 1 HRW7 27 P 018 406649 Figure 27 33 shows five 5 00 resistors Hint For each pair of points imagine that a battery is connected across the pair Fig 27 33 a Find the equivalent resistance between points F and H b Find the equivalent resistance between points F and G 5 HRW7 27 P 046 406629 In an RC series circuit E 17 0 V R 1 50 M and C 1 80 F a Calculate the time constant b Find the maximum charge that will appear on the capacitor during charging c How long does it take for the charge to build up to 10 0 C Magnetic Forces and Torques v mv r r r r r F qB F q v B q E r r r dF i dL B r r r B L Ch 28 Checkpoints and Questions 5 HRW7 28 P 024 566302 In the figure below a charged particle moves into a region of uniform magnetic field goes through half a circle and then exits that region The particle is either a proton or an electron you must decide which It spends 160 ns in the region a What is the magnitude of B b If the particle is sent back through the magnetic field along the same initial path but with 3 00 times its previous kinetic energy how much time does it spend in the field during this trip
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