In what direction is the force on a positive charge with a velocity to the left in a uniform magnetic field directed down and to the left?

1. up
2. down
3. left
4. right
5. into the screen
6. out of the screen
7. a combination of two of the above
8. the force is zero
9. this case is ambiguous - we can't say for certain

In what direction is the force on a negative charge with a velocity down in a uniform magnetic field directed out of the screen?

1. up
2. down
3. left
4. right
5. into the screen
6. out of the screen
7. a combination of two of the above
8. the force is zero
9. this case is ambiguous - we can't say for certain

In what direction is the force on a positive charge that is initially stationary in a uniform magnetic field directed into the screen?

1. up
2. down
3. left
4. right
5. into the screen
6. out of the screen
7. a combination of two of the above
8. the force is zero
9. this case is ambiguous - we can't say for certain

In what direction is the force on a negative charge with a velocity to the left in a uniform electric field directed out of the screen?

1. up
2. down
3. left
4. right
5. into the screen
6. out of the screen
7. a combination of two of the above
8. the force is zero
9. this case is ambiguous - we can't say for certain

In what direction is the velocity of a positive charge if it feels a force directed into the screen in a magnetic field directed right?

1. up
2. down
3. left
4. right
5. into the screen
6. out of the screen
7. a combination of two of the above
8. the velocity is zero
9. this case is ambiguous - we can't say for certain