Name: _______________________
Instructor:__________________
Louisiana State University Physics 2102, Exam 3,
November 11, 2010.
•
Please be sure to write your name and class instructor above.
•
The test consists of 3 questions (multiple choice), and 4 problems (numerical). All numerical quantities
must have appropriate units.
Points will be deducted if units are absent.
•
For the problems: Show your reasoning and your work –
no credit will be given for an answer without
explanation or work
. Note that in many of the problems, you can do parts (b) or (c) even if you get stuck
on (a) or (b).
•
You may use scientific or graphing calculators. Cell phones cannot be used as calculators.
•
Feel free to detach, use, and keep the formula sheet pages. No other reference material is allowed
during the exam.
•
Good Luck!
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View Full DocumentProblem 1 [20 points]
A long cylindrical wire of diameter 1.0 cm carries a total current of 75 A uniformly distributed over its
cross section.
(a) [5 pts] Calculate the current density in the wire:
(b) [8 pts] At what distance from the axis of the wire, but still
inside the wire
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 Fall '08
 GIMMNACO
 Physics, Magnetic Field, pts

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