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SP12
GCSE Separate Science Physics
| Question | Answer |
|---|---|
| Why is a bar magnet a permanent magnet? | It is always magnetic |
| What materials do magnets attract and which ones are they? | Iron, Steel, Cobalt and Nickel |
| What is a magnetic field? | The space around a magnet where it can attract magnetic materials. |
| Which poles attract and which repel? | North and south attract, North and North repel and South and South repel |
| What is an induced magnet? | When a piece of magnetic material is in a magnetic field it becomes a magnet itself. It stops when it is taken out of the field. |
| What instrument do we use to find the shape of a magnetic field? | A plotting compass |
| What is a compass? | It is a very small magnet that can move freely, it point to a position very near to the Earth’s geographic North pole. |
| Describe the Earth’s magnetic field. | It is the same shape as a bar magnets field but the acts as if the South pole of the bar magnet in the Northern hemisphere. This makes sure the North pole of a compass points North. |
| If the field line are close together is this a strong or weak field? | Strong |
| What does a current flowing through a wire produce around the wire? | A Megnetic field |
| What is the shape of a magnetic field around a wire? | It circular |
| If the direction of the current is reversed what happens to the magnetic field? | The magnetic field reverses |
| What can you use to find the direction of the magnetic field? | Plotting compass. |
| How can tell if the magnetic field is strong or weak from a field line diagram? | If the lines are close together it is strong, far apart weak. |
| If a wire is made into coil and a current passes though it what is it called? | Solenoid |
| Where is the magnetic field uniform in a solenoid? | Near the centre where the field lines are parallel ( equally spaced) |
| What does the strength of the solenoid depend upon? | Size of the current |
| How could you change the solenoid to make it stronger? | Higher current , more coils closer together, insert an iron core. |
| When does a wire carrying a current experience a force? | When it is placed between two magnets. |
| What is this effect called? | The motor effect. |
| Why is a force produced? | The current in the wire produces a magnetic field that interacts with the magnetic field between the magnets. |
| When is the force the greatest? | When the wire is perpendicular to the magnetic field between the magnets. |
| When is the force =0.? | When the wire is parallel to the magnetic field between the two magnets. |
| Flemming’s left hand rule helps us remember the direction of the force.Which finger represents the direction of the force? | Thumb |
| Which represents the direction of the current from + to -? | Second finger |
| Which represents the direction of the magnetic field between the magnets? | Index finger |
| What is the equation for the force on a conductor in a magnetic field in words? | Force = magnetic field strength x current x length |
| What it this equation in symbols ? | F= BxIx l |
| Describe an electric motor ? | A current carrying coil between 2 magnets, joined to a split ring commutator. |
| What is the job of the split ring commutator? | It always ensures that the coil always turns in the same direction. It makes the current in the coil change direction every 180 degrees. |
| 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:
Davenant Foundation School
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