8. A current carrying wire is bent into the shape shown in the figure. The two circular arcshave the same origin, O, and the inner has radius a = 2.5 mm and the outer has radius2a. Both arcs have central angles of 270°. A current of 1.5 mA flows through the wire asshown. What is the magnitude and direction of the magnetic field, caused by the current,at O? It is not necessary to derive any expressions from the Biot-Savart law, but you mustconsider the whole wire.

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