Sample Exam 2 on General Physics - General Physics ph 213...

General Physics – ph 213 Name:____________
Midterm Exam II (Ch 24 – 27) Type A
November 14, 2005
 Exam is closed book and closed notes. Use only your note card.
 Write all work and answers in the papers provided.
 Show all your work and explain your reasoning (No credit will be given for an answer
that does not include the necessary solution or explanation, except for true/false or
multiple choice questions)
 Partial credit may be awarded for a correct method of solution, even if the answer is
wrong.
Part I – True or False (2.5 points each): For questions 1 – 11, state whether each statement is true
or false.
1. The change in electric potential energy, U
b –
U
a
, is the work done on a charge by the electric
force as it moves from point a to point b .
2. The potential due to a spherically symmetric charge distribution is the same as that of a point
charge
.
3.
Equipotential surfaces are always flat and perpendicular to the electric field.
4. The units of 

, the permittivity of free space, may be expressed as F/m.
5. The fatter a given length of wire is the higher its resistance will be
.
6. In an alternating current, the charge carriers switch between electrons and protons in a repeated
fashion.
7. A 1200-W toaster draws more current than a 1000-W toaster.
Part II – Multiple choice questions: For questions 8 – 16 select the only one choice that best
answers or completes each statement.