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CP10H

GCSE Combined Science Physics

QuestionAnswer
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? FALSE What does the strength of the solenoid depend upon?
"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
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
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
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.
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