magnetism and electromagnetism
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what are the two types of magnetic poles
the two types of magnetic poles are a north (seeking) pole and a south (seeking) pole
where is the magnetic forces strongest on a magnet
the magnetic forces are strongest on the poles of a magnet
which poles attract
opposite poles attract
which poles repel
same poles repel
where can the force of a magnet can act upon something
the region around a magnet is where the force of a magnet can act upon something
what is the region around a magnet called
the region around a magnet is called a magnetic field
what factor controls the strength of the field
the distance away from the magnet controls the strength of the field
what are permament magnets
permanent magnets are magnets that produce their own magnetic field no matter the conditions
what are induced magnets
induced magnets are magnets that become one when placed in a magnetic field. when they are removed from the magnetic field they lose their magnetism quickly
what is the force between a magnet and a magnetic material
the force between a magnet and a magnetic material is always attraction
which direction do the field lines on a magnetic field go from
the field lines on a magnetic field go from north to south
what is the density of the field lines called
the density of the field lines is called the flux density and it indicates the strength of the field at that a point- the closer together the lines the higher the flux density
what happens with a higher flux density
the higher the flux density the stronger the field and the greater the force that would be felt by another magnet
what materials are magnetic
iron, nickel, cobalt and steel (alloy) are magnetic
what happens when current flows in a conducting wire
when current flows in a conducting wire a magnetic field is produced around the wire
what controls the direction of the field lines
the direction of the field lines depends on the direction of the current and can be found with the right hand grip method
how can you increase the strength of an electromagnetic field
you can increase the strength of an electromagnetic field by -increasing the number of turns in a coil -increasing the current - adding an iron core
what type of waves are electromagnetic waves
electromagnetic waves are transverse waves
at what speed do electromagnetic waves travel at
electromagnetic waves travel at the speed of light in air or in a vacuum
what does the electromagnetic spectrum include
the electromagnetic spectrum includes low energy waves/ low frequency waves to high frequency/ high energy waves
what type of light are human eyes able to detect
human eyes able to detect visible light ( a very small range of electromagnetic waves)
what does the wavelength of an electromagnetic wave determine
the wavelength of an electromagnetic wave determines how it is absorbed, transmitted, reflected or refracted by different substances. This affects it’s uses