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The animation shows a 30-mg charged object entering a region where a magnetic field and/or electric field can be applied (position is given in centimeters and time is given in seconds). The magnitude of the charge is 4 x 10^-3 C. Restart.

1. Is the object positively or negatively charged? Explain.
2. What is the magnitude of the electric field?
3. What is the magnitude of the magnetic field?
4. What voltage must be applied to the plates to create the electric field?

For an introduction to the velocity selector see Exploration 27.2.

Problem authored by Melissa Dancy.