1. Magnetism

2. The phenomenon of magnetism is best understood in terms of
the existence of magnetic poles.
the magnetic fields associated with the movement of charged particles.
gravitational forces between nuclei and orbital electrons.
electrical fluids.
None of these is correct.

3. The phenomenon of magnetism is best understood in terms of
the existence of magnetic poles.
the magnetic fields associated with the movement of charged particles.
gravitational forces between nuclei and orbital electrons.
electrical fluids.
None of these is correct.

4. The left diagram shows a positively charged particle is moving with velocity v in a magnetic field B. Using the arrows in the right diagram, what is the direction of the magnetic force on the particle?

5. The left diagram shows a positively charged particle is moving with velocity v in a magnetic field B. Using the arrows in the right diagram, what is the direction of the magnetic force on the particle?

6. The left diagram shows a force F on a negatively charged particle moving a magnetic field B. Using the arrows in the right diagram, what is the direction of the velocity of the particle?

7. The left diagram shows a force F on a negatively charged particle moving a magnetic field B. Using the arrows in the right diagram, what is the direction of the velocity of the particle?

8. If the magnetic field vector is directed toward the north and a positively charged particle is moving toward the east, what is the direction of the magnetic force on the particle? up
west
south
down
east

9. If the magnetic field vector is directed toward the north and a positively charged particle is moving toward the east, what is the direction of the magnetic force on the particle? up
west
south
down
east

10. A positively charged particle is moving northward in a magnetic field
A positively charged particle is moving northward in a magnetic field. The magnetic force on the particle is toward the northeast. What is the direction of the magnetic field? up
northeast
southwest
down
This situation cannot exist.

11. A positively charged particle is moving northward in a magnetic field
A positively charged particle is moving northward in a magnetic field. The magnetic force on the particle is toward the northeast. What is the direction of the magnetic field? up
northeast
southwest
down
This situation cannot exist.

12. The magnetic force on a charged particle
depends on the sign of the charge on the particle.
depends on the velocity of the particle.
depends on the magnetic field at the particle's instantaneous position.
is at right angles to both the velocity and the direction of the magnetic field.
is described by all of these.

13. The magnetic force on a charged particle
depends on the sign of the charge on the particle.
depends on the velocity of the particle.
depends on the magnetic field at the particle's instantaneous position.
is at right angles to both the velocity and the direction of the magnetic field.
is described by all of these.

14. An electron is traveling horizontally east in the magnetic field of the earth near the equator. The direction of the force on the electron is
zero
north
south
upward
downward

15. An electron is traveling horizontally east in the magnetic field of the earth near the equator. The direction of the force on the electron is
zero
north
south
upward
downward

16. A current I flows in a wire that is oriented as shown
A current I flows in a wire that is oriented as shown. Which of the vectors represent the magnetic field that results in a maximum force on the wire?

17. A current I flows in a wire that is oriented as shown
A current I flows in a wire that is oriented as shown. Which of the vectors represent the magnetic field that results in a maximum force on the wire?

18. A small positively charged body is moving horizontally and westward
A small positively charged body is moving horizontally and westward. If it enters a uniform horizontal magnetic field that is directed from north to south, the body is deflected
upward.
downward.
toward the north.
toward the south.
not at all.

19. A small positively charged body is moving horizontally and westward
A small positively charged body is moving horizontally and westward. If it enters a uniform horizontal magnetic field that is directed from north to south, the body is deflected
upward.
downward.
toward the north.
toward the south.
not at all.

20. A uniform magnetic field is parallel to and in the direction of the positive z axis. For an electron to enter this field and not be deflected by the field, the electron must be traveling in which direction?
any direction as long as it is in the xy plane.
any direction as long as it is in the xz plane.
along the x axis.
along the y axis.
along the z axis.

21. A uniform magnetic field is parallel to and in the direction of the positive z axis. For an electron to enter this field and not be deflected by the field, the electron must be traveling in which direction?
any direction as long as it is in the xy plane.
any direction as long as it is in the xz plane.
along the x axis.
along the y axis.
along the z axis.

22. toward the top or bottom of the page. toward one of the two wires.
Two wires lying in the plane of this page carry equal currents in opposite directions, as shown. At a point midway between the wires, the magnetic field is
zero.
into the page.
out of the page.
toward the top or bottom of the page.
toward one of the two wires.

23. toward the top or bottom of the page. toward one of the two wires.
Two wires lying in the plane of this page carry equal currents in opposite directions, as shown. At a point midway between the wires, the magnetic field is
zero.
into the page.
out of the page.
toward the top or bottom of the page.
toward one of the two wires.

24. It is parallel to but directed opposite to the current flow.
What is the direction of the magnetic field around a wire carrying a current perpendicularly into this page?
The field is parallel to and in the same direction as the current flow.
It is parallel to but directed opposite to the current flow.
It is counterclockwise around the wire in the plane of the page.
It is clockwise around the wire in the plane of the page.
None of these is correct.

25. It is parallel to but directed opposite to the current flow.
What is the direction of the magnetic field around a wire carrying a current perpendicularly into this page?
The field is parallel to and in the same direction as the current flow.
It is parallel to but directed opposite to the current flow.
It is counterclockwise around the wire in the plane of the page.
It is clockwise around the wire in the plane of the page.
None of these is correct.

26. north east west south upward
A wire carries an electric current straight out of the page. What is the direction of the magnetic field due to the current north of the wire?
north
east
west
south
upward

27. north east west south upward
A wire carries an electric current straight out of the page. What is the direction of the magnetic field due to the current north of the wire?
north
east
west
south
upward

28. A long conductor carrying current I lies in the xz plane parallel to the z axis. The current travels in the negative z direction, as shown in the figure. The vector that represents the magnetic field at the origin O is

29. A long conductor carrying current I lies in the xz plane parallel to the z axis. The current travels in the negative z direction, as shown in the figure. The vector that represents the magnetic field at the origin O is

30. Two straight wires perpendicular to the plane of this page are shown in the figure. The currents in the wires are the same. The current in M is into the page and the current in N is out of the page. The vector that represents the resultant magnetic field at point P is

31. Two straight wires perpendicular to the plane of this page are shown in the figure. The currents in the wires are the same. The current in M is into the page and the current in N is out of the page. The vector that represents the resultant magnetic field at point P is

32. Two very long, parallel conducting wires carry equal currents in the same direction, as shown. The numbered diagrams show end views of the wires and the resultant force vectors due to current flow in each wire. Which diagram best represents the direction of the forces?

33. Two very long, parallel conducting wires carry equal currents in the same direction, as shown. The numbered diagrams show end views of the wires and the resultant force vectors due to current flow in each wire. Which diagram best represents the direction of the forces?

34. Two very long, parallel conducting wires carry equal currents in opposite directions. The numbered diagrams show end views of the wires and the resultant force vectors due to current flow in each wire. Which diagram best represents the direction of the forces?

35. Two very long, parallel conducting wires carry equal currents in opposite directions. The numbered diagrams show end views of the wires and the resultant force vectors due to current flow in each wire. Which diagram best represents the direction of the forces?