Chapter 28, Problem 28.7E

A negative charge q = −3.60 × 10⁻⁶ C is located at the origin and has velocity $\stackrel{\to }{\text{v}}$ = (7.50 × 10⁴ m/s)î + (−4.90 × 10⁴ m/s)ĵ. At this instant what are the magnitude and direction of the magnetic field produced by this charge at the point x = 0.200 m, y = −0.300 m, z = 0?