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A point charge Q moves on the x-axis in the positive direction with a speed of 160 m/s. A point P is on the y-axis at y = +20 mm. The magnetic field produced at the point P, as the charge moves through the origin, is equal to -0.6 μT k^k^. What is the charge Q? (μ 0 = 4π × 10-7 T · m/A)