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Four long, straight wires that are oriented perpendicular to the
page carry currents I, 21, 31, and 5I, as shown in the figure. The
wires are all the same distance, d, from the point, P.
Write a symbolic expression for the net magnetic field at the
point, P, in terms of I, d, and constants (as needed).
=
5I
2
O
e
●
I
d
31
·
21

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