Magnetism

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

• not interact with each other at all

• attract each other

• repel each other

Magnetic domains are..

• regions of atoms magnetically aligned

• blocks of materials

• regions that may or may not be magnetized

• cluster of atoms randomly aligned

The source all magnetism is

• materials

• tiny pieces of iron

• moving electric charges

• tiny domains of aligned atoms

The reason a magnet can attract an magnetized nails is that

• nails become temporarily magnetized in a magnetic field

• nails become permanently in a magnetic field

• nails really are magnetized

• a magnet can attract any metal object

Magnetism is produced by the motion of the electrons as they spin

• spin on their axes

• move around the nucleus

• both A&B

• none of the above

Earth' magnetic field is most likely due to

• convection currents in the molten part of Earth's interior

• millions of small magnets buried in the Earth

• a magnetized solid inner core of Earth

• the rotation of Earth acting on all of Earth's electrons

• none of the above

In order to make an electromagnet, you need a

• magnet, a nail and some wires

• battery, a nail, and a magnet

• battery, coil of wire, and a nail

• loop of wire, magnet, and a battery

• none of the above

If a compass is moved from the Northern Hemisphere to the Southern Hemisphere, its magnetic needle will change direction

• by 90 degrees

• not at all

• by 180 degrees

• none of the above

An iron rod becomes magnetic when

• its electrons stop moving and point in the same direction

• positive ions gather at one end and negative ions at the other end

• the magnetic domains of its electrons point in the same direction

• positive charges line up on one side and negative charges on the other side

• none of the above

If you break a bar magnet in half, each half

• becomes a bar magnet with two poles

• becomes unmagnetized

• contains one magnetic pole

• none of the above