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Physics 2220.004
Spring 2006
Final Examination
Name:
This test consists of
9 multiplechoice questions and 7 freeresponse problems
, for a total of
110 points (so that 10 points of extra credit are possible).
To receive credit for the freeresponse
problems, you must show all of your work on the pages provided.
Don’t hand in any extra
sheets or other paper.
You may also earn partial credit for the some of the multiple choice
problems if you show your work.
Suggested procedure for solving the problems:
1.
Read each problem carefully and make sure you know what is being asked before starting the
problem.
2.
Draw a figure for the problem.
3.
List the parameters given.
4.
Write down the equations to be used.
5.
Solve for the answer symbolically.
6.
Substitute numbers into you final equation and circle your answer.
WORK THE EASY PROBLEMS FIRST!!
1.
(4 points) When a
conductor
is in electrostatic equilibrium, the electric field on its surface
will never be
a)
perpendicular to the surface.
b)
tangent to the surface.
c)
zero.
d)
proportional to the charge density on the surface.
e)
greatest where the radius of curvature of the surface is greatest.
2.
(5) A charge
Q
= 5.00 nC is placed on a conducting ring of radius
a
= 20.0 cm. The electric
potential at the center of the ring is
a) 1.12 kV
b) 25.0 V
c) 125 V
d) 225 V
e) 1.41 kV
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View Full Document 3. (5) A wire with a resistance
R
is stretched out to 5 times its original length. (Its volume is
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This note was uploaded on 09/07/2010 for the course PHYS 2220 taught by Professor Littler during the Spring '00 term at North Texas.
 Spring '00
 Littler
 Physics, Magnetism

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