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5. The same current flows through each of the wires
sketched at right. For which case is the magnetic field
at point O the largest? (All segments are circular or
straight. Radii are d or d/2. When wires point off along
straight lines, they continue to infinite distance.)
A) Case 1.
C) Case 3.
B) Case 2.
D) Case 4.
E) Case 5.
Case 1
O
Case 4
O
Case 2
Case 5
Case 3

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