**1. The problem statement, all variables and given/known data**

A charged particle moves in a straight line through a particular region of space. Could there be a nonzero magnetic field in this region? In either case, include a sketch as well as prose in your justification.

**2. Relevant equations**

**3. The attempt at a solution**

The force that a magnetic field exerts on a charged particle moving through it is given by F=qvB, sin theta = qvB where B is the component of the field perpendicular to the particles velocity. Since the particle moves in a straight line the magnetic force must be zero.

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