GCSE Combined Science Physics
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Why is a bar magnet a permanent magnet? | " It is always magnetic
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| " What materials do magnets attract and which ones are they? | "Iron, Steel, Cobalt and Nickel
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| " What is a magnetic field? | " The space around a magnet where it can attract magnetic materials.
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| " Which poles attract and which repel? | "North and south attract, North and North repel and South and South repel
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| " "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.
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| " What instrument do we use to find the shape of a magnetic field? | "A plotting compass
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| " 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.
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| " "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.
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| " If the field line are close together is this a strong or weak field? | Strong
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| What does a current flowing through a wire produce around the wire? | A Megnetic field
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| What is the shape of a magnetic field around a wire? | It circular
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| If the direction of the current is reversed what happens to the magnetic field? | The magnetic field reverses
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| What can you use to find the direction of the magnetic field? | Plotting compass.
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| 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.
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| If a wire is made into coil and a current passes though it what is it called? | Solenoid
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| Where is the magnetic field uniform in a solenoid? | "Near the centre where the field lines are parallel ( equally spaced)
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| " What does the strength of the solenoid depend upon? | Size of the current
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| "How could you change the solenoid to make it stronger? | " "Higher current , more coils closer together, insert an iron core.
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| " Two like poles always ______ | repel
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| Tow opposite poles always _______ | attract
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| What is a permanent magnet? | A magnet that produces its own magnetic field.
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| What is an induced magnet? | A magnetic material which becomes a magnet when placed in a magnetic field.
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| A magnetic material which becomes a magnet when placed in a magnetic field is a _______ _________ | induced magnet
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| What type of magnet loses its magnetism when it is removed from a magnetic field? | induced magnet
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| Which three elements are magnetic? | iron, cobalt and nickel
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| Draw the magnetic field around a bar magnet | teacher to draw on board…
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| Give the name for the magnet created using a coil of wire | solenoid
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| Where is the strongest field in an electromganet created by a coil of wire? | inside the coil
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| What two words describe the magnetic field within the coil of a solenoid? | strong and uniform
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| What is an electromagnet? | A solenoid containing an iron core which increases its strength
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| What is an important property of a solenoid/electromagnet as a magnet | can be switched on and off with electric current
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| Flemming's left hand rule shows the relative directions of what things? | Force, magnetic field and current
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| In Flemming's LH rule, the thumb gives the direction of … | Force
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| In Flemming's LH rule, the second finger gives the direction of … | Current
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| In Flemming's LH rule, the first finger gives the direction of … | Magnetic Field
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| 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
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| 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
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| 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
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| What is the unit of magnetic flux density? | Tesla (T)
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| What two methods can you use to obesrve the field around a bar magnet? | Iron filings or plotting compass
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| Draw the magnetic field between two like poles. | teacher to draw on board…
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| Draw the magnetic field between two unlike poles. | teacher to draw on board…
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| The right hand thumb rule shows relative direction of… | current and magnetic field around a wire
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| The strength of magnetic field surrounding a conducting wire depends on… | Size of current and distance from wire
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| State the equation which links current, force, length of conductor and magnetic flux density | F=BIl
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| Which rule can be used to determine the direction a motor will rotate? | Flemming's left hand rule.
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Davenant Foundation School
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