Magnetism

The source of all magnetism is  

• moving electric charges
• ferromagnetic materials
• tiny domains of aligned atoms
• tiny pieces of iron

Moving electric charges will interact with  

• an electric field
• a magnetic field
• both A and B
• none of the above

An iron rod becomes magnetic when 

• positive charges line up on one side and negative charges on the other side
• positive ions gather at one end and negative ions at the other end
• its electrons stop moving and point in the same direction
• the net spins of its electrons point in the same direction

Surrounding every moving electron is  

• an electric field
• a magnetic field
• an electric and magnetic field
• none of the above

Magnetism is produced by the motion of electrons as they 

• move around the nucleus
• spin on their axes
• both A and B
• neither A or B

If the north pole of one magnet is brought near the south pole of another magnet, the poles will 

• repel
• attract
• not interact
• How am I supposed to know that!

If you break a bar magnet in half, each half  

• becomes a bar magnet with two poles
• becomes unmagnetized
• contains one magnetic pole
• says 'hey man, what did I ever do to you?!'

If you put a small compass in a magnetic field, the compass will  

• swing randomly
• line up in a direction parallel to the magnetic field lines
• line up in a direction perpendicular to the magnetic field lines
• seek electrical charge concentrations

Magnetic field strength is 

• strongest close to a magnet
• constant everywhere
• strongest far from a magnet

Magnetic fields are produced by  

• moving particles on earth
• charges at rest
• moving particles
• moving charged particles