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Square Current Loop A uniform magnetic field B = 1.8 T points in the +z direction. A square loop with side length d = 20 cm, number of turns N = 12, and current I = 0.85 A per turn pivots without friction around a vertical pin aligned with the z-axis. The left panel shows a side view of the loop in the zy-plane. The loop is tilted at an angle 8 = 30 relative to the vertical zz-plane. The pivot is at the origin. The segment of the loop labeled CD lies in a plane that is rotated about the z-axis by the angle @. Gravity acts downward along the y direction, and the magnetic field points horizontally along +z. The right panel shows the top-down view of the loop, which is square with both horizontal and vertical sides of length d. Segment CD lies across the top edge of the square, and current circulates counterclockwise in the loop when viewed from above. A mass M is hung from one vertical side of the Loop, either from point C or point D. The system is in equilibrium at the angle 6 described above. Side View of Loop Plan View of Loop Determine the magnitude of the mass M. Enter a positive number if the mass is hung from point C, and a negative number if it is hung from point D. M= kg