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Terms in this set (24)
What do magnetic field lines show?
Strength and direction
What does a uniform magnetic field look like?
How do you investigate the magnetic field?
Iron filings for shape
Plotting compasses for direction
How can you magnetise a magnetic material?
Put it in a magnetic field (vibrate and heat)
Stroke it with another magnet repeatedly in the same direction
How can you demagnetise a magnet?
Vibrate or heat it and place it in an alternating magnetic field
What are the properties of a hard magnetic material?
Difficult to magnetise and demagnetise (Steel)
What are the properties of a soft magnetic material?
Easier to magnetise and demagnetise (iron)
What is an electromagnet?
A magnet consisting of a core, often made of soft iron that is temporarily magnetized by an electric current flowing through a coil that surrounds it
How do you make an electromagnet?
Wrapping coils of wire around a core and connecting the coils of wire to a power supply
How do you increase the strength of an electromagnet?
Add a soft iron core
More turns of wire around the core
Increase the current flowing through the wire
What is the right hand grip rule?
What does an electric bell work?
Why does the electromagnet turn on?
The switch is pressed, the circuit is completed so current flows
What happens to a particle moving in a magnetic field?
It will experience a force as long as the particle isn't moving parallel to the magnetic field
What is Flemming's left hand rule?
How do you increase the size of the force?
increase current through the wire
Increase the strength of the magnet
What is the motor effect?
2 magnetic fields (current carrying wire and the permanent magnet) interact causing a force
how do you increase the size of the force?
More turns of coil
What does a loudspeaker look like?
Describe electromagnetic induction
A wire cuts magnetic field lines, a voltage is induced.
If the conductor is in a complete circuit, the induced voltage causes a current in the circuit.
How to increase the current in an electromagnet
Turn it faster.
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