a- Find the magnetic field at the center of a circular loop of radius R carrying current 1. b- Find the magnetic field a distances from a long thin wire carrying current I. c- As shown in the figure, an insulated wire is bent into a circular loop of radius R and has two long straight sections. The loop is in the xz-plane, with the center at the origin. The straight sections are parallel to the y-axis. The wire carries a current of I. What is the magnetic field at the origin? R