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Two infinitely long straight currents are parallel to z axis. One of them, carrying a current...

Two infinitely long straight currents are parallel to z axis. One of them, carrying a current I1, intersects at the x-y plane at the point (x1, y1); the other, with current I2, intersects at the x-y plane at the point (x2, y2). Find the resultant B produced by them at any point (x, y, z).

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