Magnetism Flashcards
What are the properties of magnets?
- Magnets attract ferromagnetic materials (such as nickel, cobalt, steel, iron)
- They cause temporary magnetism in the ferromagnetic material they are in near or in contact with it. eg when a magnet is placed in conatct with a paperclip, it can attract another clip
- When freely suspended, magnets will line up roughly north-south
- Like poles will repel and unlike poles with attract
Where is the strength of the magnet greatest at?
At the poles (ends)
What is a magnetic field?
A region in which the force of attractive/repulsive forces can be experienced.
What are magnetic field lines drawn for?
To show the direction of a magnetic field at any point.
Magnetic field lines always point…
…north to south.
The stronger the magnetic field lines…
…the stronger the magnetic field.
The magnetic field lines are the same…
…as the direction of the force experienced by a north pole, if placed in the field.
How would you demonstrate plotting field lines?
By using a trail of magnets or iron filings.
Any conductor with currnet flowing through it…
…generates a magnetic field.
What are the three main types of current-carrying conductors?
- Long straight wire
- Circular loop
- Solenoid/coil
How would you determine the direction of a magnetic in a current carrying conductor?
The right-hand grip rule.
What is a solenoid?
A coil whose length is longer than the radius of the coil.
How would you demonstrate plotting a magnetic field in a long straight wire?
By placing a number of plotting compasseson a flat piece of card with a long straight conductive wire. The compsses will all point north. Pass a current through the conductor and the compasses will line up to show a circular magnetic field. Verify with the right hand grip rule.
