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**1. Homework Statement**

In a certain region, the earth's magnetic field has a magnitude of 5.5 x 10-5 T and is directed north at an angle of 40° below the horizontal. An electrically charged bullet is fired north and 19° above the horizontal, with a speed of 700 m/s. The magnetic force on the bullet is 3.9 x 10-10 N, directed due east. Determine the bullet's electric charge, including its algebraic sign (+ or -).

**2. Homework Equations**

F=qvBsintheta

**3. The Attempt at a Solution**

3.9E-10N= q* 700m/s(V)*5.5E-5T (B)*sin19

=3.1E-8N