Magnetism Flashcards
What do we call the 2 poles of a magnet?
North and south.
How can field lines show you the strength of a magnetic field?
The denser the field lines (the closer together they are), the stronger the magnetic field will be.
What is a magnet?
A magnet is any material or object that produces a magnetic field.
Which direction do magnetic field lines point?
From the north pole to the south pole.
North ➔ South
How can you use a compass to visualise field lines?
The needle of a compass always points along a field line towards the south pole, so can be used to find the field lines of a magnet.
Place the plotting compass near the magnet on a piece of paper.
Mark the direction the compass needle points.
Move the plotting compass to many different positions in the magnetic field, marking the needle direction each time.
Join the points to show the field lines.
How can you use iron filings to visualise field lines?
Place the magnet under a piece of card.
Sprinkle iron filings over the piece of card.
Tap the piece of card - this will cause the iron filings to accumulate along the field lines.
What are magnetic field lines?
Magnetic field lines are arrows that show the magnetic field around an object.
Which 4 metals are magnetic (3 elements and 1 alloy)?
Nickel
Cobalt
Iron
Steel.
Remember them as NCIS.
Is iron magnetically soft or hard?
Iron is magnetically soft.
It gains and loses its magnetism slowly.
What is the difference between a magnetically soft and a magnetically hard material?
Magnetic materials that gain and lose magnetism quickly are called magnetically soft materials.
Magnetic materials that gain and lose magnetism slowly are called magnetically hard materials.
What is a magnetic material?
A magnetic material is any material or object that can be influenced by a magnetic field, and has the potential to become a magnet.
What is the difference between a permanent and an induced magnet?
Permanent magnets always produce their own magnetic field (like a bar magnet on your fridge).
Induced magnets (also known as ‘temporary magnets’) only produce a magnetic field in the presence of another magnet.
Is steel magnetically soft or hard?
Steel is magnetically hard.
It gains and loses its magnetism quickly.
Is the magnetic force between an induced magnet and the permanent magnet that created it attractive or repulsive?
It will always be attractive.
How do you make an induced magnet?
Place a magnetic material into a magnetic field, this will induce it to temporarily have its own magnetic field.
