PS250 PHYSICS III FOR ENGINEERS – Exam 1 Material Summary
Chapter 21 Learning Objectives: Understand concept of electric charge. Calculate vector forces due to point
charges. Calculate vector electric fields due to point charges and/or continuous charge distributions. Calculate
electric forces on point charges in electric fields. Understand electric field lines and electric dipole torques.
Lectures 1-4. Mastering Physics Assignment #1; Homework Problems: 21.9, 19, 30, 31, 33, 47, 52, 59, 89, 98.
21.1 – Electric Charge
21.2 – Conductors, Insulators, Induced Charge
21.3 – Coulomb’s Law
Board Examples: Hydrogen atom electric vs. gravitational force. Resultant force on a third charge in a system.
Find position where total force on a third charge is zero.
21.4 – Electric Field and Electric Force
Board Example: Electric field due to two charges. Electric force acceleration of particles in constant fields.
21.5 – Electric Field Calculations
Board Example: Electric fields due to a charged rod, a ring of charge, a disk of charge, a big disk of charge.
21.6 – Electric Field Lines
Board Example: Conceptual discussion and java applet: http://www.falstad.com/emstatic/
21.7 – Electric Dipoles
Chapter 22 Learning Objectives: Understand concept of electric flux. Calculate electric flux through open and
closed surfaces. Understand fundamentals of Gauss’s Law. Apply Gauss’s law to calculate electric fields for
symmetrical problems (i.e., spheres, infinite cylinders, parallel plates). Understand conductors vs. insulators.
Lectures 5-6. Mastering Physics Assignment #2; Homework Problems: 22.2, 8, 14, 15, 32, 39, 46, 58.
22.1 – Electric Flux
22.2 – Calculating Electric Flux
Board Example: Electric flux through open surfaces. Electric flux through closed boxes.
22.3 – Gauss’s Law
Board Example: Electric flux through a cube due to external vs. internal charge sheet.
22.4 – Applications of Gauss’s Law
Board Examples: Calculation of fields for various geometries, i.e. book examples: 22.5, 22.6, 22.7, 22.8, 22.9
22.5 – Charges on Conductors
Board Example: Calculation of fields inside and on conducting objects, i.e. surface charge on metal sphere.
Chapter 23 Learning Objectives: Understand relationship between electric potential and potential energy.
Calculate electric potential and/or potential energy due to point charges. Calculate potentials of continuous
charge distributions. Obtain potential from electric field. Obtain electric field from potential using the gradient.
Lecture 7-8. Mastering Physics Assignment #3; Homework Problems: 23.5, 23, 28, 32, 40, 45, 57, 65, 68.
23.1 – Electric Potential Energy
Board Example: Proton in a constant electric field (comparison with falling object in gravitational field).
23.2 – Electric Potential
Board Examples: Potentials of charged particles and between charged planes, systems of point charges.
23.3 – Calculating Electric Potential
Board Examples: Potential difference between points near an infinite line charge. Potential of finite line
charge. Also consider classical examples of symmetric line charge, ring of charge, disk of charge.
23.4 – Equipotential Surfaces (Conceptual)
Board Example: Conceptual discussion and java applet: http://www.falstad.com/emstatic.
23.5 – Potential Gradient
Board Examples: E-field vs. potential between two plates. E-field vs. potential of single charge.
PS-250-07DB: Fall, 2015. Exam #1 Material Summary.
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