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A long wire is bent into the shape shown...

A long wire is bent into the shape shown in the figure. Without cross-contact at P. Determine the magnitude and direction of B at the center of the circular portion of radius R when a current I flows as indicated.

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`(mu_(0)i)/(2R)(1+1/pi)`, out the page
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NN GHOSH-MAGNETIC EFFECT OF CURRENT-Exercises
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