A loop bent in the shape below carries a conventional current in the direction marked. What is the magnitude 
of the magnetic field at the point a on the diagram
due to just the horizontal segments of the loop?
A. ?0I/4?R
B. ?0I/4R
C. ?0I/8R
D. ?0I/2R
E. ?0I/R
F. Zero
F. Zero
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