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**Problem Statement:**

A negatively charged particle moves in a uniform magnetic field that has a positive x-direction. The magnetic force on the particle is in the negative z-direction. What can you conclude about the z-component of the particle’s velocity?

**Options:**

- \( v_z < 0 \)
- \( v_z = 0 \)
- Not enough information given to decide
- \( v_z > 0 \)

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