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Figure 28.1
20 cm-
-110 μ.
+100 UT
-100 μ.
+120 μ.
-120 μ.
20 cm
45°
10 cm
20 cm
↓
O
A circular loop of radius 10 cm and three long straight wires carry currents of I1 =90A, 12 = 60 A, 13 = 40 A, and
14 = 80 A, respectively, as shown. Each straight wire is 20 cm from the center of the loop. In Fig. 28.1, the
y-component of the resultant magnetic field at the center of the loop is closest to:
T

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