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In the figure, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 16.5 cm.
Each wire carries 3.50 A, and the currents are out of the page in wires 1 and 4 and into the page in wires 2 and 3. In unit-vector
notation, what is the net magnetic force per meter of wire length on wire 4?
Number
-2.23
î
+
7.25
a
a
3
·x
ĴUnits N/m

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