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1 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif)
- Drag your mouse (slightly down and left works well) so that the directions of all three vectors are visible.
- Note the sign of the charge and verify that the vectors are consistent with the right-hand rule.
What will happen if you increase the magnitude of the charge? |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | Only the acceleration vector will get longer. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | Only the acceleration vector will get shorter. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | Both the velocity and acceleration vectors will get longer. |
| ![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | Both the velocity and acceleration vectors will get shorter. |
| ![](/olcweb/styles/shared/spacer.gif) | E)![](/olcweb/styles/shared/spacer.gif) | Everything will stay the same. |
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2 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) What will happen if you make the charge positive and increase the magnitude? |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | Only the acceleration vector will get longer, in the opposite direction as before. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | Only the acceleration vector will get longer, in the same direction as before. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | The acceleration will remain zero. |
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3 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) What will happen if you decrease the magnitude of the magnetic field? |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | Only the acceleration vector will get longer. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | Only the acceleration vector will get shorter. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | Only the magnetic field vector will get shorter. |
| ![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | Only the magnetic field vector will get longer. |
| ![](/olcweb/styles/shared/spacer.gif) | E)![](/olcweb/styles/shared/spacer.gif) | Both the magnetic field and acceleration vectors will get longer. |
| ![](/olcweb/styles/shared/spacer.gif) | F)![](/olcweb/styles/shared/spacer.gif) | Both the magnetic field and acceleration vectors will get shorter. |
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4 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) What will happen if you increase the magnitude of the magnetic field in the opposite direction from before? |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | Both the magnetic field and acceleration vectors will get longer in the same directions as before. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | The magnetic field will get longer in the opposite direction as before while the acceleration will get longer in the same direction as before. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | Both the magnetic field and acceleration vectors will get longer in the opposite directions as before. |
| ![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | Both the magnetic field and acceleration vectors will get longer in the opposite directions as before while the velocity vector also reverses direction. |
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5 | ![](/olcweb/styles/shared/spacer.gif) | ![](/olcweb/styles/shared/spacer.gif) Given the present situation (of charge, field, and velocity), describe the motion of the particle? |
| ![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | The charge will move in a circular path, clockwise as viewed from above. |
| ![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | The charge will move in a circular path, counterclockwise as viewed from above. |
| ![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | The charge will move in an elliptical path, clockwise as viewed from above. |
| ![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | The charge will move in an elliptical path, counterclockwise as viewed from above. |
| ![](/olcweb/styles/shared/spacer.gif) | E)![](/olcweb/styles/shared/spacer.gif) | The charge will move in an helical path, spiraling along the direction of the magnetic field. |
| ![](/olcweb/styles/shared/spacer.gif) | F)![](/olcweb/styles/shared/spacer.gif) | The charge will move in an helical path, spiraling in the opposite direction of the magnetic field. |
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