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AP PHYSICS 2
Magnetism Problem Set #1
1. What kind(s) of field surround(s) a stationary electric charge? What kind(s) of fields surround(s) a
moving electric charge? (Hewitt, 36-21)
2. Pigeons have magnetite in their brains. Bees have magnetite in their abdomens. Can a stationary
pigeon or stationary bee use those magnets to navigate? (Hewitt, 36-29)
3. What is the likely source of Earth’s magnetic field?
4. Every several hundred thousand years, the polarity of Earth’s magnetic field has shifted. What are
some implications of Earth losing its magnetic field, even temporarily? (Hewitt, 36-30)
5. Two magnets exert a force on each other. At 10 cm from their surfaces, magnet A produces a field
strength of 2 T while magnet B produces a field strength of 0.5 T. How does the force exerted on
magnet A by magnet B compare to the force on magnet B by magnet A? Write your answer as a
ratio: FA on B : FB on A:: ________: _________. Briefly explain your answer. (Hewitt, 36-24)
6. When a charged particle moves parallel to the direction of the magnetic field, describe the force it
experiences due to the magnetic field. (Giancoli, 20-MC4)
7. A proton enters a uniform magnetic field that is perpendicular to the proton’s velocity. What
happens to the kinetic energy of the proton? Does it increase, decrease, stay the same? Briefly
explain your answer. (Giancoli, 20-MC9)
8. How much current is flowing in a wire 4.80 m long if the maximum force on it is 0.62 N when
placed in a uniform 0.0800-T field? (Giancoli, 20-2)
9. A current of wire I points out of the page as shown at the
right. Draw a vector representing the direction and relative
magnitude of the magnetic field (in the plane of the page) at
point C, D, and E. (Giancoli, 20-29)
10. The magnetic force on a wire is measured to be only 45% of the maximum possible value. What is
the angle between the wire and the magnetic field? (Giancoli, 20-5)
11. Find the direction of the force on a NEGATIVE charges in each of the diagrams below. (Giancoli, 2012)
AP Physics 2
Magnetism 1 Problem Set
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12. Determine the direction of the magnetic field in each of the diagrams below. Assume that F
represents the maximum magnetic force on a positively charged particle moving with velocity v.
13. An electron experiences the greatest force as it travels 2.8 x 106 m/s northward in a magnetic field.
The force is vertical upward and has a magnitude of 6.2 x 10-13 N. Wath is the magnitude and
direction of the magnetic field? (Giancoli, 20-18)
Use the scenario below to answer questions 14 - 15.
14. What is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an
electric field and a magnetic field. Assume E has a magnitude of 7.7 x 103 V/m and is perpendicular
to B that has a magnitude of 7.5 x 10-3 T. (Giancoli, 20-14a)
15. What is the radius of the electron orbit if the electric field is turned off? (Giancoli, 20-14b)
AP Physics 2
Magnetism 1 Problem Set
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