Magnets Review

The region around a magnet in which magnetic forces can act is called the Magnetic field Domain Pole solenoid

A)Magnetic field

The marked end of a compass needle always points directly to A) earth’s geographic south pole B) earth’s geographic north pole C) magnet’s south pole D) magnet’s north pole

B) earth’s geographic north pole

What do you end up with if you cut a magnet in half? One north-pole piece and one south-pole piece two unmagnetized pieces Two pieces, each with north and south pole Two north pole pieces

C) Two pieces, each with north and south pole

Earth’s magnetic field Is produced by a giant magnet at the center of the Earth Is produced by movement of electric charges in Earth’s core Does not change over time Bends outward at the magnetic poles

b)Is produced by movement of electric charges in Earth’s core

Which of the following is NOT true about an electromagnet? It can be strong enough to levitate a train The current may be turned on or off Its strength is reduced by adding more loops It consists of an iron core and current-carrying wire

c)Its strength is reduced by adding more loops

Any material that attracts iron or materials containing iron is called Solenoid Magnet Superconductor semiconductor

b) Magnet

All magnets a) have two poles b) Exert forces c) Are surrounded by a magnetic field d) All of the above

d) All of the above

The magnetic effects of a bar magnet are Evenly distributed throughout a magnet Distributed randomly in a magnet Concentrated near the ends None of the above

c) Concentrated near the ends

Sometimes the magnetic strip on a credit card becomes demagnetized Sometimes the magnetic strip on a credit card becomes demagnetized. The strip is most likely a Permanent magnet Temporary magnet Electromagnet geomagnet

b)Temporary magnet

If you attach a magnet to a string so that the magnet is see to rotate, you will see that one end of the magnet will point North Southwest East west

a) North

The Earth has neither an east pole nor west pole because a)The earth is a sphere and has no poles b) The earth is a sphere and has only one pole called an axis c) The earth is like a bar magnet, which has two poles d) None of the above

c) The earth is like a bar magnet, which has two poles

A compass needle is A fixed magnet A fixed nonmagnetic piece of metal A magnet that is free to rotate A nonmagnetic piece of metal that is free to rotate

C) A magnet that is free to rotate

Magnetic poles always occur Alone In pairs In threes In fours

B) In pairs

The magnetic force will pull magnets apart if you hold the North poles of two magnets together South poles of two magnets together North pole of one magnet near the south pole of another magnet Both A and B

d)Both A and B

The magnetic force will pull magnets together if you hold the North poles of two magnets together South poles of two magnets together North pole of one magnet near the south pole of another magnet Both A and B

C) North pole of one magnet near the south pole of another magnet

Magnetic poles are similar to electric charges in that Like poles repels and opposite poles attract The magnetic force is equal to the electric force The number of magnetic domains responsible for the poles is conserved. The mass of magnetized particle is conserved

A) Like poles repels and opposite poles attract

The magnetic field around a bar magnet can be modeled by drawing Curved lines from the north pole of the magnet to the south pole Curved lines near the south pole of the magnet Straight lines from the north pole and from the south pole Circular lines around the entire magnet

A) Curved lines from the north pole of the magnet to the south pole

Whether a material is magnetic depends on _____ in the material Molecules Atoms Number of neutrons Number of protons

B) Atoms

A magnet can be demagnetize if a) it is dropped b) it is heated c)it is stuck very hard d) all of the above

d) all of the above

A magnet, usually within an iron core, produced by an electric current is Electromagnet Ferromagnet Temporary magnet Permanent magnet

A) Electromagnet

Turbines generally turn the _______ in a generator, inducing an electric current Transformer Magnet Wire loop solenoid

B) Magnet

Which of the following is currently being used to turn turbines in generators? a) steam b) water c) wind d) all of the above

d) all of the above

The interaction between electricity and magnetism is called a) electromagnetism b) Electromagnetic induction

a) electromagnetism