PS250 PHYSICS III FOR ENGINEERS – Exam 2 Material Summary
Chapter 24 Learning Objectives: Understand concept of capacitance, and mathematical relation between
charge, potential difference, and capacitance. Calculate capacitance for parallel plate, cylindrical, and spherical
capacitors. Calculate equivalent capacitances for parallel and series capacitors. Calculate and understand
energy storage in capacitors. Understand dielectric constant and dielectric strength.
Lecture 10-11. Mastering Physics Assignment #4; Problems: 24.9, 12, 13, 17, 21, 30, 53, 66, 67, 69.
24.1 – Capacitors and Capacitance
Board examples: Calculation of capacitance for coaxial, spherical, and parallel-plate capacitors.
24.2 – Capacitors in Series and Parallel
Board examples: Multiple parallel plate capacitors, combining series/parallel capacitors.
24.3 – Energy Storage in Capacitors and Electric Field Energy
Understand physical meaning + Board Examples: derivation of stored energy in field.
24.4 – Dielectrics
Board Examples: Effects of dielectric materials, change in capacitance, energy storage, potential.
Chapter 25 Learning Objectives: Understand concept of current (I) and current density (J). Understand physical
basis for resistivity and resistance, and how they are related. Understand Ohm’s law in terms of potential
difference and electric field in the conductor). Understand concept of electromotive force for ideal (r=0) and
realistic (r≠0) sources (i.e., batteries, etc.). Understand simple circuits involving resistors and emf sources.
Understand power and energy in circuits (i.e., P=IV)
Lecture 12-14. Mastering Physics Assignment #5; Problems: 25.3, 13, 18, 29, 41, 62, 69.
25.1 – Current
Understand definitions of current, drift velocity, current density.
25.2 – Resistivity
Board Examples: Ohm’s Law in vector and scalar forms, definitions of resistivity.
25.3 – Resistance
Board Examples: Copper wire examples (choosing required dimensions).
25.4 – Electromotive Force and Circuits
Board Examples: Wire examples, ideal/non-ideal source examples, pencil lead example.
25.5 – Power and Energy
Board Examples: Max power transfer example, general examples with resistors, short circuit examples.
Chapter 26 Learning Objectives: Understand parallel and series combinations of resistors, and be able to
calculate equivalent combinations. Understand Kirchhoff’s Rules, and be able to apply them to determine
potential differences across and currents through devices in a simple circuit. Understand R-C circuits, and be
able to obtain time-dependent expressions for i(t), q(t), and v(t) during capacitor charging and discharging.
Lecture 14-15. Mastering Physics Assignment #6-7; Problems: 26.7, 10, 18, 19, 25, 27, 41, 45, 48, 66.
26.1 – Resistors in Series and Parallel
Board Examples: Pencil Lead example, circuit combination example, please also understand the homework!
26.2 – Kirchhoff’s Rules
Board Examples: Simple 2-Loop analysis problem (also understand the homework problems!)
26.4 – R-C Circuits
Board Examples: Detailed On-Board Derivations, examples 26.12, 26.13, also a Quiz.
Chapter 27 Learning Objectives: Understand the geometry of magnetic fields and the concept of poles.
Calculate force on moving charged particles due to magnetic fields. Understand magnetic flux, and Gauss’s laws.
Calculate particle motions (cyclotron frequency and radii) in magnetic fields. Understand how a velocity selector
works. Calculate magnetic force on a current-carrying conductor.
Lecture 16-17. Mastering Physics Assignment #7; Problems: 27.4, 6, 15, 23, 25.
PS-250-07DB: Fall, 2015. Exam #2 Material Summary.
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PS250 PHYSICS III FOR ENGINEERS – Exam 2 Material Summary
27.1 – Magnetism
Understand “dipole” model of Earth’s field (i.e., what is really “North” and “South”).
27.2 – Magnetic Field and Force
Board Examples: Initial Force on Proton.
27.3 – Magnetic Flux
Board Examples: Quick Conceptual Discussion (i.e., that it is zero for a closed surface!!!)
27.4 – Motion of Charged Particles
Board Examples: Proton launched from origin, radius of orbit, period of orbit, helical trajectories.
27.5 – Applications of Motion of Charged Particles
Board Examples: Velocity Selector / Mass Spectrometer (Conceptually).
PS-250-07DB: Fall, 2015. Exam #2 Material Summary.
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