Two concentric circular loops lie in the same plane and share the same center. The inner loop has radius 3.0cm and carries a current of 5.0A that is counter-clockwise when viewed from above. The outer loop has radius 5.0cm and carries a current of 3.0A that is clockwise when viewed from above. Using μ0=4π×10−7T⋅m/A, what are the magnitude and direction of the net magnetic field at the common center?
a) 2.1×10−5T out of the page
b) 1.4×10−4T into the page
c) 6.7×10−5T out of the page
d) 1.0×10−4T out of the page