A wire is bent into a half-circle of radius 0.10m. Two straight radial segments connect the ends of the half-circle to its center, but the magnetic field at the center due to the radial segments can be ignored. A current of 5.0A flows through the wire. What is the magnitude of the magnetic field at the center of the half-circle? (Assume the permeability of free space has its standard value.)
a) 3.1×10−5T
b) 2.6×10−5T
c) 1.6×10−5T
d) 1.0×10−5T