As shown in the figure, an insulated wire is bent into a circular loop of radius 6.0 cm and has two long straight sections. The loop is in the xy-plane, with the center at the origin. The straight sections are parallel to the z-axis. The wire carries a current of 8.0 A. What is the magnitude of the magnetic field at the origin? (HQ = 4x x 107/T . m/A) 8.0 AT 8.0 A X 6.0 cm 8.0 AT O 81 AT O 88 AT O 110 AT O 75 HT O 120 ATThe figure shows the cross-section of a hollow cylinder of inner radius a = 5.0 cm and outer radius b = 7.0 cm. A uniform current density of 1.0 A/ cm- flows through the cylinder parallel to its axis. Calculate the magnitude of the magnetic field at a distance of d = 10 cm from the axis of the cylinder. (u( = 4x x 10-7 T . m/A) O 0.00 T O 1.5 x 10-4 T 0.50 x 10-4 T O 4.5 x 10-4 T O 2.5 x 10-4 T