Two charged particles are projected into a magnetic ?eld that is perpendicular t

Question

Two charged particles are projected into a magnetic ?eld that is perpendicular to their initial velocities. If the charges are de?ected in opposite directions, what does this tell you about them? (Ignore the interaction between these two particles.)

1. They have opposite charges if their initial velocities are in the same direction.
2. Their velocities have opposite directions.

3. One particle comes from nature; the other is man-made.
4. One particle is an electron and the other is a positive ion.

Explanation / Answer

Two charged particles are projected into a magnetic field that is perpendicular to their velocities. If the charges are deflected in opposite directions, what does this tell you about them?

If the particles move in the same direction in the field and are deflected in opposite directions, the charges must be of opposite sign.

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