magnetic fields Flashcards
What are the 4 magnetic materials
iron, steel, nickel and cobalt
features of a permanent magnet
it produces it’s own magnetic field
The magnetic field cannot be turned on and off - it is there all the time
Induced magnet
An induced magnet only becomes a magnet when it is placed in a magnetic field. The induced magnetism is quickly lost when the magnet is removed from the magnetic field
Iron fillings around a bar magnet become induced magnets what are there properties
they are only attracted by other magnets, they are not repelled
they lose most or all of their magnetism when they are removed from the magnetic field
Testing for magnetism a permanent magnet
attract or repel another permanent magnet
attract a magnetic material (but not repel it)
how to test if a magnet is permanent
check if it repels another magnet
magnetic field
is the region around a magnet where a force acts on another magnet or on a magnetic material.
how to detect a magnetic field
via a magnetic compass
how can you map out a magnetic field
- 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
When drawing a magnetic field what instructions must you obay
the magnetic field lines never cross each other
the closer the lines, the stronger the magnetic field
the lines have arrowheads to show the direction of the force exerted by a magnetic north pole
the arrowheads point from the north pole of the magnet to its south pole
When drawing a magnetic field what instructions must you obey
the magnetic field lines never cross each other
the closer the lines, the stronger the magnetic field
the lines have arrowheads to show the direction of the force exerted by a magnetic north pole
the arrowheads point from the north pole of the magnet to its south pole
