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Magnetism
GCSE Physics and combined science
| Question | Answer |
|---|---|
| The places on a magnet where the magnetic forces are the strongest are called the… | poles |
| What is the definition of a magnetic field? | The area around a magnet where a force acts on another magnet or magnetic material |
| The area around a magnet where a force acts on another magnet or magnetic material in the… | Magnetic field |
| Two like poles always ______ | repel |
| Tow opposite poles always _______ | attract |
| What is a permanent magnet? | A magnet that produces its own magnetic field. |
| What is an induced magnet? | A magnetic material which becomes a magnet when placed in a magnetic field. |
| A magnetic material which becomes a magnet when placed in a magnetic field is a _______ _________ | induced magnet |
| What type of magnet loses its magnetism when it is removed from a magnetic field? | induced magnet |
| Which three elements are magnetic? | iron, cobalt and nickel |
| Draw the magnetic field around a bar magnet | teacher to draw on board… |
| Give the name for the magnet created using a coil of wire | solenoid |
| Where is the strongest field in an electromganet created by a coil of wire? | inside the coil |
| What two words describe the magnetic field within the coil of a solenoid? | strong and uniform |
| What is an electromagnet? | A solenoid containing an iron core which increases its strength |
| What is an important property of a solenoid/electromagnet as a magnet | can be switched on and off with electric current |
| Flemming's left hand rule shows the relative directions of what things? | Force, magnetic field and current |
| In Flemming's LH rule, the thumb gives the direction of … | Force |
| In Flemming's LH rule, the second finger gives the direction of … | Current |
| In Flemming's LH rule, the first finger gives the direction of … | Magnetic Field |
| When a conductor carrying a current is placed in a magnetic field, the magnet and the conductor …. | exert an equal and opposit force on one another |
| Give three ways of increasing the force of a solenoid. | Add iron core, increase number of coils of wire, increase current, move magnetic material closer |
| Give three ways of increasing the force of a motor. | Increase the number of coils of wire, increase the strength of the magnetic field, increase the current |
| What is the unit of magnetic flux density? | Tesla (T) |
| What two methods can you use to obesrve the field around a bar magnet? | Iron filings or plotting compass |
| Draw the magnetic field between two like poles. | teacher to draw on board… |
| Draw the magnetic field between two unlike poles. | teacher to draw on board… |
| The right hand thumb rule shows relative direction of… | current and magnetic field around a wire |
| The strength of magnetic field surrounding a conducting wire depends on… | Size of current and distance from wire |
| State the equation which links current, force, length of conductor and magnetic flux density | F=BIl |
| Which rule can be used to determine the direction a motor will rotate? | Flemming's left hand rule. |
Created by:
JBearfield
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