1. which of the following is a true statement about magnetic fields?
a. they must always form complete loops.
b. they point from south pole to north pole.
c. they can be created only by magnetic domains.
d. they point from positive charges to negative charges.

2. which of the following could be the cause of the magnetic properties of a bar magnet?
a. vibrating magnetons within the magnet
b. molten metal convecting inside the magnet
c. open magnetic field lines entering the magnet
d. electrons moving inside the atoms of the magnet

3. the opposite poles of two magnets will do which of the following?
a. attract one another
b. repel one another
c. attract or repel one another, depending on orientation
d. not interact with one another

4. which of the following describes how a stationary proton will interact with magnetic fields?
a. it will both be affected by magnetic fields and create magnetic fields.
b. it will neither be affected by magnetic fields nor create magnetic fields.
c. it will be affected by magnetic fields but will not create a magnetic field.
d. it will not be affected by magnetic fields but will create a magnetic field.

5. magnet a has two ends. if the first end is attracted to a known magnetic south pole and repelled by the upward end of magnet b, what is the polarity of the upward end of magnet b?
a. north
b. south
c. either north or south

6. if the north pole of a magnet in a compass is attracted to earth's geographic north, what must be the polarity of earth's magnetic north pole?
a. north
b. south
c. it can't be determined from the information given.

7. magnetic domains are which of the following?
a. a type of magnetic pole
b. created by stationary charges
c. regions within some types of magnetic materials
d. a way to prevent magnetic fields from entering a region

8. the left side of magnet x is attracted to one end of magnet z and also to one end of magnet y. what is the polarity of the left side of magnet x?
a. north
b. south
c. either north or south

9. a magnetic field line must
a. go on forever.
b. form a closed loop.
c. have a north and south pole.
d. be created by a permanent magnet.

10. magnetic "monopoles" have never been found in nature nor been created. because of this, scientists believe that magnets must
a. form closed loops.
b. decrease in strength over time.
c. have both north and south poles.
d. be created by moving charged particles.