Transcript Review for Test #1

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 sheet or 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 25.66
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 -15.0 nC. (a)
Determine the electric field and (b) the electric
potential over all space.