A long straight wire, perpendicular to the page, passes through a uniform external magnetic field. The net magnetic field at point 3 is zero. a. What is the direction of the current in the wire? Explain. b. Points 1 & 2 are the same distance from the wire as point 3, and point 4 is twice as distant. Construct vector diagrams at points 1, 2, & 4 to determine the net magnetic field at each point. Draw them into the given picture (not elsewhere). . Rank the magnitudes of net magnetic field using >, > r, where L is the length of the wire & ris the distance away from the center of the wire. Explain and show work, as always with symbolic equation first, then values plugged in. Recall |Bati" away from straight wire | = e LI r 'r2+('')2 Uniform B-field 1 L O wire - _ 4' where (:12) =107 w|g