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10/30/08 11:39 PM
CH 17 HW 3 F2008
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CH 17 HW 3 F2008 (Homework)
BAKER KRISTINE NICOLE
PY 208M, section 004, Fall 2008
Instructor: Laura I. Clarke
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Current Score:
30 out of 30
Due:
Monday, September 29, 2008 12:30 PM EDT
Description
Magnetic field of currents
Instructions
Reading: Sec 17.7
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1. 2/2 points
A straight wire of length
0.68
m carries a conventional current of
0.4
amperes. What is the magnitude
of the magnetic field made by the current at a location
2.9
cm from the wire? Use both the exact
formula and the approximate formula to calculate the field.
(a) result using exact formula
B
=
2.75e6
T
(b) result using approximate formula
B
=
2.76e6
T
2. 21/21 points
A wire through which a current is flowing lies along the xaxis as shown. Connecting wires which are
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 Spring '08
 Chabay

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