19. Each wire produces a field with magnitude given by
B
=
µ
0
i
/2
π
r
, where
r
is the
distance from the corner of the square to the center. According to the Pythagorean
theorem, the diagonal of the square has length
2
a
, so
ra
=
2 and
Bi
a
=
0
2
π
.
The fields due to the wires at the upper left and lower right corners both point toward the
upper right corner of the square. The fields due to the wires at the upper right and lower
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This note was uploaded on 06/08/2010 for the course PHY 1356 taught by Professor Bonamente during the Spring '10 term at UAA.
 Spring '10
 Bonamente

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