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Q1. An unknown charge is moving in the positive y-direction with a speed of 7.5x10 m/s producing a magnetic field. Just as it passes the origin, a magnetic field of 2.50x10-13 T [into the page] is measured at the point at location (x=1.5 mm, y=1.5mm). What is the charge of the unknown charge [both magnitude and sign]? [2 marks] (1.5 mm, 1.5 mm) B B q =? X