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3. A loop of wire is bent to have straight and circular arc shaped parts as shown in the figure. A constant
current I of 36A flows through the wire in the direction depicted in the figure. If the length R equals
13 cm, determine the magnitude and the direction of the magnetic field produced by the loop of wire
at point O by using Biot-Savart's Law (µo-~1.26x10-6 T.m/A)
4R
4R
6R
6R
2R

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