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The question asks what happens to the speed of a charged particle moving through a region where only magnetic forces are acting on it. To answer this, let's examine the nature of magnetic forces.

Magnetic forces do not do work on charged particles. This is because the magnetic force is always perpendicular to the velocity of the particle (as defined by the right-hand rule in physics). As a result, the magnetic force changes the **direction** of the particle's velocity, not its **speed**. Since work is related to changes in kinetic energy (which depends on speed), the speed of the particle remains **constant**.

So, the correct answer to this question is:

- **The particle's speed stays constant.**

Would you like further clarification on this, or perhaps details on how magnetic forces interact with charged particles?

Here are 5 questions to expand on this topic:
1. How does the right-hand rule apply to determine the direction of magnetic force on a particle?
2. What is the relationship between the Lorentz force and a charged particle in a magnetic field?
3. How does the velocity vector of the particle evolve if the magnetic field is uniform?
4. What is the impact of an electric field acting alongside a magnetic field on a charged particle’s motion?
5. Can a magnetic field change the kinetic energy of a charged particle?

**Tip:** Remember, magnetic forces influence the **direction** of a particle's velocity but not its **magnitude** (speed).

If a charged particle is moving through a region of space where the only forces acting on it are magnetic forces, what happens to the speed of the particle?

This problem addresses how magnetic forces affect the motion of a charged particle. Specifically, it explores whether a magnetic field can change the speed of the particle. The solution involves understanding that magnetic forces, being perpendicular to the velocity, alter only the direction, keeping the speed constant.

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