704700
Description
Flashcards by harrilou24, updated more than 1 year ago
|
Created by harrilou24
about 10 years ago
|
|
| Question | Answer |
| Which poles attract and which repel? | Like poles repel and unlike poles attract, for example N and N or S and S repel but N and S attract. |
| What is a ferrous material? | A ferrous material contains iron, for example steel. Any ferrous material can be magnetised and demagnetised. |
| How is magnetism induced? | Magnetism is induced in a bar of ferrous material when a magnet is placed near it. |
| What is a line of force? | A line of force (also called a field line) of a magnetic field is a line along which a plotting compass points. |
| What does a magnetic field look like around a bar magnet? |
Image:
bar_magnet (image/jpg)
|
| What do the magnetic field lines of a bar magnet look like? | The magnetic field lines of a bar magnet curve from the North pole of the bar magnet around to the South pole of the bar magnet. |
| How can an iron or steel bar be magnetised? | By repeatedly moving a pole of a bar magnet along the bar in one direction. And by withdrawing the bar from a long coil carrying direct current. |
| What is a 'hard' magnetic material? | A 'hard' magnetic material is a material harder to magnetise and demagnetise rather than a 'soft' magnetic material. |
| In magnetic terms what is the metal that is 'hard'? | Steel |
| In magnetic terms, what is the material that is 'soft'? | Iron |
| What are iron and steel used for? | Iron is used in an electromagnet and steel is used in a permanent magnet. |
Want to create your own Flashcards for free with GoConqr? Learn more.