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4. I1, I2 and Is carry currents of 5A, 4A and 3A respectively as shown in figure 4. The distance between I1 and 12 is 7 cm and between 12 and 13 is 8 cm. a) Determine the magnitude and direction of the magnetic field where In is. (10 pts) (b)Determine the magnitude and direction of the net force acting on wire 1. (10 pts) 12 I3 Figure 4 4 7 cm-4 8 cm 5. The ammeter shown in figure 6 reads 5.00 A. Determine the values of I1, I2 and E. (20 pts) 8 0 10 0 12 20 V Figure 5 E 120 Optional Extra Credit 6. In Niels Bohr's 1913 model of the hydrogen atom, an electron circles the proton at 5.29.10-11 m with a speed of 2.10 m/s. Compute the magnitude of the magnet field that this motion produces at the location of the proton

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