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Find the magnetic induction at the point O of the following figures if the wire carrying a current I = 15A has the shapes shown here. The radius of the curved part R=5cm, the linear parts of the wire are very long.

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The correct Answer is:
a) `B=(mu_(0)I)/(4piR)sqrt(pi^(2)+4)= 0.11 mT, b) B=`(mu_(0)I)/(4piR)sqrt(2+2pi+pi^(2))`= 0.13mT, (C ) B = `(mu_(0)I)/(8piR)sqrt(8 + 9pi^(2) = 0.15 mT
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