PHYS-224 Test #2 (Chapters 28,29,30,31)

Things to remember:

Conceptual things you should be able to do (ie, in addition to the homework type problems from Mastering Physics)

• Use work and energy arguments to determine whether potential or kinetic energy increases or decreases as an object moves between two locations in an electric field.
      (See student workbook pg. 29-2 #2, pg. 29-5 #9, and pg 29-6 #10)
• Given a set of equipotential lines, draw a graph of V vs x. Or, given a graph of V vs x, draw a set of equipotential lines.
      (See student workbook pg. 29-9 #9,10)
• Rank the electric potentials for a set of locations around a point charge.
      (See student workbook pg. 29-11 #20,21,22)
• Estimate the electric field strength from a set of equipotential lines.
      (Student workbook pg. 30-2 #4, pg. 30-3,4 #6,7,8,10)
• Rank a set of resistors based on dimensions and material
      (Student workbook pg. 30-9 #18 and pg. 31.5 #12,13)
• Parallel and series combinations of capacitors
      (Student workbook pg. 30-13 #27,28,29)
• Series and Parallel combinations of resistors
      (Student workbook pg. 31.7-8 #16,18,20,21,22)
• Rank the brightness of lightbulbs in a circuit
      (Student workbook pg. 31.10 #26,27,28,29)

Tasks which might involve numerical answers (in addition to the Mastering Physics homework)

• Relationships between current, drift velocity, current density, electric field, conductivity (or resistivity)
• Use kinetic and potential energy to determine the speed and/or distance travelled for a charge released from rest in an electric field
• Calculate the potential energy stored in a collection of point charges
• Integrate an electric field to get the potential difference between two locations (or use the area under a graph)
• Take the derivative of V to get E as a vector (or calculate the slope of a graph)
• Use a graph of V to get a graph of E versus r (and use a graph of E to get a graph of V)

• Calculate the equivalent resistance of a combination of resistors (and the current through, potential difference accross, or power dissapated in any individual resistor)
• Calculate the equivalent capacitance of a combination of capacitors (and the charge on, potential difference accross, or energy stored in any individual capacitor)\

End of chapter problems you should be able to do but which were not part of Mastering Physics Homework

• Chapter 30, problems 5,6,7, 40, 43, 44, 61-65

Here's a blank copy of Practice Test #2

Here's a the answers --- but don't look at these until after you have worked the practice test.