Chapter 10.2

Question 1

What is the most important cause of magnetism in magnetic materials?

Answer 1

Electron spin

Question 2

What is a group of aligned atoms with a single magnetic field?

Answer 2

Domain

Question 3

What happens if a magnet is cut in half?

Answer 3

The domains align to create a North and South pole on both halves.

Question 4

What happens if domains are not mostly aligned?

Answer 4

The fields will cancel each other out.

Question 5

What is the term for the type of substances, such as diamonds, that have no unpaired electrons and are always slightly repelled by either poles of a magnet?

Answer 5

Diamagnetic

Question 6

What type of substances, such as aluminum, have only one unpaired electron per atom?

Answer 6

Paramagnetic

Question 7

What type of substances, such as cobalt and nickel, have several unpaired electrons per atom, which makes them strongly attracted to magnets?

Answer 7

Ferromagnetic

Question 8

What are materials whose domains strongly resist changes in the direction of their magnetic fields?

Answer 8

Magnetically hard

Question 9

What are magnets made from magnetically hard materials?

Answer 9

Permanent magnets

Question 10

What is the method of magnetizing a needle by bringing a strong magnet close to, but not actually in contact with a magnetically soft substance such as pure iron?

Answer 10

Magnetizing by induction

Question 11

How are the strength of an electromagnet and the number of loops of wire in the coil related?

Answer 11

Strength is proportional to the square of the number of loops. (If you double the loops, the strength will quadruple.)

Question 12

What is the resistance of a magnet to being demagnetized by a magnetic field?

Answer 12

Coercivity

Question 13

What is the force existing in a magnetic field that causes a moving electric charge to deviate from its original path?

Answer 13

Deflecting force