Using appropriate technology, you determine that Earth's magnetic field at your location has a magnitude of 5.36 × 10 ^-5 T and is directed north at an angle of 59? below the horizontal. You charge a metallic projectile and fire it north with a speed of 641 m/s and at an angle of 14? above the horizontal. Determine the sign (+ or ?) and charge of the projectile, if the magnetic force on the projectile is 2.85 × 10 ^-10 N, directed due west.