A circular loop of radius 10 cm and three long straight wires carry currents of I1 = 60 A, I2 = 20 A, I3 = 10 A, and I4 = 10 A, respectively, as shown. Each straight wire is 20 cm from the center of the loop. In Figure 28.1, the y - component of the resultant magnetic field at the center of the loop is closed to: + 15 mu T - 20 mu T + 20 mu T - 17 mu T - 15 mu T A long straight wire on the z - axis carries a current of 6.0 A in the positive direction. A circular loop in the x - y plane, of radius 10 cm, carries a 1.0 A current, as shown. Point P, at the center of the loop, is 25 cm from the z - axis In Figure 28,6d, an electron is projected from P with a velocity of 4.0 times 106 m/s in the negative x - direction. If y - component of the force on the electron is closed to: + 4.0 times 10 - 18 N - 4.0 times 10 - 18 N zero + 2.0 times 10 - 18 N - 2.0 times 10 - 18 N