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In a certain region, the earth's magnetic field has a magnitude of 4.8 x 10-5 T and is directed north at an angle of 66° below the horizontal. An electrically charged bullet is fired north and 13° above the horizontal, with a speed of 630 m/s. The magnetic force on the bullet is 3.7 x 10-10 N, directed due east. Determine the bullet's electric charge, including its algebraic sign (+ or -).

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