Review for Test #3  Responsible for: - Chapters 23, 24, 25, and 27 (except 24.5, 25.7, 25.8, and 27.5) - Notes from class - Problems worked in class - Homework assignments  Test format: - 18 multiple-choice problems (5.56 points each) - 2 bonus problems (5 points each) - Time: 75 minutes  Test materials: - Pencil, eraser, and non-programmable calculator - No formulae sheetor paper; all provided - Closed textbook and notes

Material Covered  Chapters 23: Electric Fields - electric charge, the Coulomb force - the electric field of point charges and charge distributions - electric field lines - motion of charge particles in electric fields  Chapter 24: Gauss’s Law - Electric flux and Gauss’s Law - Gauss’s law for charge distributions - Conductors in electrostatic equilibrium  Chapter 25: Electric Potential - potential energy and electric potential difference - electric potential due to point charges and charge distributions

- electric potential due to point charges and charge distributions - equipotential surfaces - the electric field from the electric potential - electric field of a charged conductor  Chapter 27: Current and Resistance - electric current - Ohm’s law - conductivity, resistivity and resistance - microscopic model of conduction, drift speed, mean free path - temperature dependence of resistivity - electric power - simple electric circuits with resistors Scores available by the following Tuesday

Example Problem 27.7 An electric current is given by the expression I(t)=100sin(120  t) where I is in amperes and time is in seconds. What is the total charge carried by the current from t=0 to t=1/240 s? Example Problem Consider two thin, conducting, spherical shells of radius r1=15.0 cm and charge 10.0 nC and r2=30.0 cm with a charge of nC. (a) Determine the electric field and (b) the electric potential over all space.