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4. I1, I2 and I3 carry currents of 5A, 4A and 3A respectively as shown in figure 4. The distance
between Ij and Í2 is 7 cm and between I2 and I3 is 8 cm.
(a) Determine the magnitude and direction of the magnetic field where Ij is. (
(b)Determine the magnitude and direction of the net force acting on wire 1.
I2
I3
Figure 4
7 cm-
8 cm

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