### Description:

This simulation shows charges with various properties moving in a magnetic field. The direction of the magnetic field is shown by the pink arrows with X indicating a field pointing into the screen and o indicating a field pointing out of the screen. The force on each charge is shown by a vector in black.

You can restart the current simulation by clicking 'Reset' and then 'Play'.

### Question 19:

Start the simulation with a single charge which is not moving initially. The field in this case points to the right. Describe what happens. Why doesn't the charge move? Describe what would have happened in this case had it been an electric field instead of a magnetic field.

### Question 20:

Start the simulation with a single moving charge using the button below. The field in this case points to the right. Why isn't the charge deflected? Describe what would have happened in this case had it been an electric field pointing in the same direction instead of a magnetic field.

### Question 21:

Start the simulation with three objects traveling at the same velocity perpendicular to a magnetic field using the button below. In this case the field points away from you (into the screen). Explain why each object has a different path. Describe what would have happened in this case had it been an electric field pointing in the same direction instead of a magnetic field.

### Question 22:

Start the simulation with the same three objects as previously but with twice the magnetic field using the button below. In this case the field points away from you (into the screen). Describe the difference in the motion of each of the three charges compared to the last case.

### Question 23:

Start the simulation with three different charges, +Q, +2Q and +3Q traveling at the same velocity perpendicular to a magnetic field using the button below. In this case the field points away from you (into the screen). Describe the difference in the motion of the three charges. Which has the greater force acting on it? Which has the greater velocity (Careful! Trick question!)?

### Question 24:

Start the simulation with three identical charges, traveling at the same different velocities perpendicular to a magnetic field using the button below. Describe the difference in the motion of the three charges. Which has the greater force acting on it?  Which direction does the magnetic field point in this case?