(Answered) Question a closed loop of wire abcd consists of two

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Question: A closed loop of wire ABCD consists of two semicircular segments AB and CD of radii R₁ = 2.00 cm and R₂ = 4.00 cm, and two straight segments BC and DA. The loop is carrying current I = 15.0 A.

Find the magnitude and direction of magnetic field B^→ at the center of semicircles 0. (Hint: carefully use Biot-Savart law for each segment of the current loop)

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