The figure shows four arrangements of circular loops of radius \( r...

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The figure shows four arrangements of circular loops of radius \( r \) or \( 2 r \) centered on vertical axes (perpendicular to the loops) and carrying identical currents in the direction indicated, in which arrangement, the magnitude of the net magnetic field at the dot is the greatest.
img title=Screenshot 2023-04-09 023359.png src=https://d2bps9p1kiy4ka.cloudfront.net/5b09189f7285894d9130ccd0/5c878ead-46a2-4e63-b9dd-c8ff9faa7c06.png alt= width=460 height=227 /
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