P4.1 Flashcards
What is a force?
Forces can be either a contact or non-contact force
What is a magnet?
It is any object with a magnetic field around it and it will exert a force on a magnetic field
Which way do field lines go?
North to south
What happens when the field lines are closer?
The stronger the magnet
What is a permanent magnet?
A magnet that always has a magnetic field around it.
What do permanent magnets do?
They attract/repel other permanent magnets, but also sometimes non-magnets
What happens if a permanent magnet is brought close to a non-magnet?
The non-magnet will have magnetism induced in them.
What is the earth’s magnet?
The earth’s north poles is a magnet’s south pole
Explain the similarities and differences between the earth’s gravitational field and magnetic fields?
Both gravitational and magnetic fields exert non-contact forces?
Gravitational force is only attractive
The magnetic force is both attractive and repulsive
Do field lies ever cross?
No, field lines will never cross
What happens when a current flows in a wire?
A magnetic field is generated around it
What happens to the space between consecutive field lines?
The space between them increases as the distance gets longer from the wire
What happens to the field lines is the current is greater?
The field lines become close together showing a stronger magnetic field.
What is a solenoid?
It is a device that acts to increase the strength/size of the magnetic field around the current carrying wire.
What are solenoid used for?
They are able to produce magnetic fields much stronger than found in natural magnets are used to produce electromagnets.
