In a certain region, the earth's magnetic field has a magnitude
of 5.4 × 10-5 T and is directed north at an angle of 46°
below the horizontal. An electrically charged bullet is fired north
and 17° above the horizontal, with a speed of 660 m/s. The magnetic
force on the bullet is 3.9 × 10-10 N, directed due east.
Determine the bullet's electric charge, including its algebraic
sign (+ or -).
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