А Question 20. (10 points) Four, long, parallel power lines each carry 100-A currents. A cross-sectional diagram of thes

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А Question 20. (10 points) Four, long, parallel power lines each carry 100-A currents. A cross-sectional diagram of these lines is a square of length 1 = 10.0 cm on each side as shown below. Calculate the magnetic field at the center of the square (magnitude and direction). i) Вх What is the net magnetic field at the center of the square if the direction of the currents 1, and Ic is reversed (I. goes out of page, le goes into the page), while I, and lo are unchanged? (magnitude and direction) 5.0 A SOA Question 21 (10 points) As shown in the figure, a wire is bent into the shape of a tightly closed omega (O), with a circular loop of radius 4.0 cm and two long straight sections. The loop is in the xy-plane, with the center at the origin. The straight sections are parallel to the r-axis. The wire carries a 5.0-A current as shown. What is the magnitude of the magnetic field at the center of the loop? (uo - 4 x 10-7T-m/A) 4.0 cm 50 A SO A