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Two long wires are parallel to the zaxis and are located at x = 0, y = ±a. Take a = 5 cm.
a) Find B at point P with b = 3 cm, given that the wires carry equal currents in opposite direction I₁ = I₂ = 6 A.
B = (i+i) T
b) At what point is B equal to 25% of the magnitude of the magnetic field at origin (0, 0, 0)? (Hint, find the magentic field at origin first.)
b = cm.

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