Magnetism

Question 0

The north end of the magnet can be determined by hanging a magnet by a string and allowing it to swing freely. True or false

Answer 0

True

Question 1

When lodestones are suspended by piece of string, they always point in the same direction. True or false

Answer 1

True

Question 2

The end of the magnet that points to the north is called the south seeking pole, and the opposite end of the magnet is the north seeking pole. True or false

Answer 2

False

Question 3

A Compass is made so it can easily line the north end of the compass needle to the earths magnetic South Pole. True or false

Answer 3

True

Question 4

The reason most metals are not magnetic is because their Atoms tend to Pair off in orbits with opposite spins so that their magnetic field cancel each other. True or false

Answer 4

True

Question 5

Ferrous metals do not contain any iron and therefore cannot be magnetize. True or false

Answer 5

False

Question 6

If the magnetizing force is applied to the end of an iron bar, the magnetic field of many of the ferrous molecule electrons will align with each other and the bar will demonstrate magnetic properties. True or false

Answer 6

True

Question 7

When magnetize material keeps its magnetic field for a long time, it is a permanent magnet. Hard iron or steel is used for permanent magnets. True or false

Answer 7

True

Question 8

If a metal loses its magnetism quickly, it is a temporary magnet. Soft iron is used for temporary magnets. True or false

Answer 8

True

Question 9

If a permanent magnet is struck with a hammer, it will lose some of its magnetism; each subsequent blow helps the molecules return to their original random positions. True or false

Answer 9

True

Question 10

Magnetic lines of force can cross each other. True or false

Answer 10

False

Question 11

The law of attraction and repulsion of magnetic states, like poles attract and unlike polls oppose each other. True or false

Answer 11

False

Question 12

Soft iron can be used to make a stronger magnet than hard steel, but the instant the magnetizing force is removed, the soft iron loses all of its magnetism. True or false

Answer 12

True

Question 13

Hard steel retains a relatively large amount of its magnetism but it does not have the magnetic strength of soft iron. True or false

Answer 13

True

Question 14

Permeability describes the relative ease with which a metal material can be magnetized. True or false

Answer 14

True

Question 15

Soft iron has a high permeability, where as hard steel is hard to magnetize, which means it has a low permeability. True or false

Answer 15

True