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© njctl.org AP Physics 2 Magnetism
AP Physics 2
Magnetic Field
Multiple Choice
1. A straight wire carries a current into the page. What is the direction of the magnetic field
at a point east of the wire? a. North b. South c. West d. East
2. Above there is a circular loop of wire that has a counterclockwise current running
through it. What is the direction of the magnetic field inside of the loop? a. North b. South c. Into the page d. Out of the page © njctl.org AP Physics 2 Magnetism
Questions 3-4
The wire above has a current being carried to the right and point P is a distance r away from the wire.
3. What is the direction of the magnetic field at P?
a. Out of the page b. Into the page c. Left d. Right
4. By how much would the magnetic field change if the current was doubled and the
distance r was doubled? a. Doubled b. Halved c. Quadrupled d. No change
5. A wire carries current out of the page in a region of magnetic field directed north. What is
the direction of the magnetic force on the current due to the magnetic field? a. North b. South c. West d. East © njctl.org AP Physics 2 Magnetism
Questions 6-7
The wire above has a current I flowing to the left of the page, a mass m, and a length L.
6. In what direction would a magnetic field have to be placed so that the magnetic force
could cancel out the gravitational force on the wire? a. Up b. Down c. Out of the page d. Into the page
7. If the magnitude of the magnetic field is B what must the magnitude of this field be to
cancel out the gravitational force on the wire? a. mg/IL b. m/IL c. IL/mg d. mgL/I
8. An electron enters a region of uniform magnetic field in the -Z direction. What is the
direction of the magnetic force on the electron due to the magnetic field? a. +X direction b. +Y direction c. -X direction d. -Y direction © njctl.org AP Physics 2 Magnetism
9. A physics student sets up an experiment with a long wire carrying current in the +Y
direction and a small ball attached to a thread with a charge of -q. Assuming that the student cannot observe or measure changes in tension in what way can the student move the ball so that there will be an observable magnetic force acting on the ball? a. +X direction b. +Z direction c. +Y Direction d. X direction
10. A horizontal wire is carrying current to the east and a proton is moving with a velocity v
to the west. What is the direction of the magnetic force acting on the proton due to the current carrying wire? a. North b. South c. West d. East © njctl.org AP Physics 2 Magnetism
11. A circular loop of wire carries current in a counterclockwise direction. The loop is placed
in a uniform magnetic field directed into the page. What is the effect of the magnetic force on the loop due to the field? a. Rotates with respect to its axis b. Rotates with respect to its diameter c. Contracts in size d. Expands in size
12. Shown above are two identical bar magnets that are fixed in place with a proton moving
to the right about to enter the region between these two magnets. Which statement below best describes what happens to the proton while travelling in between the magnets? a. It curves downward and strikes the bottom magnet b. The proton continues to move to the right in a straight line c. It curves upward and strikes the top magnet d. The proton stops and moves to the left in a straight line © njctl.org AP Physics 2 Magnetism
Questions 13-14
A magnetic field is created by the two parallel currents flowing in opposite directions.
13. At what point is the magnetic field the greatest in magnitude?
a. B b. C c. D d. E
14. What is the direction of the net magnetic field at point B?
a. Left b. Right c. Top of the page d. Bottom of the page
15. Two parallel wires carry current in opposite directions. What is the direction of the
magnetic force on the current going into the page due to the current going out of the page? a. Left b. Right c. Top of the page d. Bottom of the page © njctl.org AP Physics 2 Magnetism
16. An electron enters a uniform electric field perpendicular to the field lines. What must be
the direction of the magnetic field in order to cancel the electric force effect? a. Left b. Right c. Into the page d. Out of the page
17. An electron enters a uniform electric field perpendicular to the field lines. What is the
magnitude of the magnetic field if the electric effect completely canceled? a. Ev b. v/E c. E/v d. Zero
18. What is the magnitude of the magnetic field at point B produced by a current I if the
magnitude of the field at point A is B0? a. B0 b. 2B0 c. 4B0 d. B0 /2 © njctl.org AP Physics 2 Magnetism
19. Two parallel wires carry currents I1 and I2 in the same direction and separated by a
distance d. The magnitude of the magnetic force between the wires is F0. What is the force between the wires if each current is doubled and the separation is quadrupled? a. 2F0 b. 4F0 c. F0 d. F0 /2
Questions 20-22
Shown above is a mass spectrometer with a positively charged particle placed in between two charged plates. The magnetic field is uniform and directed out of the page.
20. What is the direction of the electric field between the charged plates?
a. Left b. Right c. Top of the page d. Bottom of the page
21. In what direction will the particle move between the charged plates?
a. Left b. Right c. Up d. Down
22. Assuming that the particle escapes the region between the charged plates and enters
the region with the uniform magnetic field, which statement below would best describe a. Semi-circular downward path b. Semi-circular upward path c. Parabolic downward path d. Parabolic upward path © njctl.org AP Physics 2 Magnetism
23. An electron with a mass m and a charge e enters a uniform magnetic field B at a velocity
v. What is the radius of the curvature of the electron in the field? a. mv/eB b. eB/mv c. me/vB d. mB/ev
Questions 24-26
Shown above is a magnet on the left placed onto an electronic balance that gives a reading of
100g. To the right the same magnet is placed on the electronic balance but a wire carrying
current into the page is placed directly in between the north and south ends of the magnet. To the right the balance now reads 115 g.
24. What is the direction of the magnetic force acting on the wire?
a. Left b. Right c. Top of the page d. Bottom of the page © njctl.org AP Physics 2 Magnetism
25. What would happen if the current was increased in the wire?
a. The balance reading would decrease b. The balance reading would increase c. The balance reading would stay the same d. The balance reading would increase for a few seconds and then go back to its original readingquotesdbs_dbs4.pdfusesText_7
[PDF] PSI Physics - Magnetism Multiple Choice Questions