Magnets and magnetic fields Flashcards
What are the names of the poles of a magnet?
North and South
What is a magnetic field?
A region where a magnetic field experiences a force
What are the 3 magnetic materials?
cobalt, nickel and iron
What are magnetic field lines used for?
To show the size and direction of magnetic fields
What direction do magnetic field lined point from?
North to south
What is the strength of a magnetic field called?
Magnetic flux density
What is the strength of a magnetic fields measured in?
teslas
What does placing a north and south pole of two permanent magnets create?
A uniform field between these two poles
Give an example of a substance that can be used to show magnetic field patterns
iron fillings
How do you use iron fillings to show magnetic field patterns?
Put a magnet underneath a piece of paper and scatter the iron fillings on top.
The iron fillings will align themselves with the field lines
How would you use a compass to plot magnetic field patterns?
Put the magnet on a piece of paper and place the compass on the paper next to the magnet.
The compass needle will point in the direction of the of the field lines at this position.
Mark the direction that the compass needle is pointing in by marking two dots on the paper one at each end of the needle.
Move the compass so that the tail end of the needle is where the tip of the needle was previously.
Repeat this and then join up the marks you have made you will end up with a drawing of one field line around the magnet.
Repeat this method at different points around the magnet to get several field lines
Why is using a compass better than using iron fillings?
The drawing of the field will still be there once you have moved the magnet and the drawing also shows the direction of the field lines
What direction will compasses always point when not near a magnet?
north
True of false the earth has a magnetic core?
True
What is the law of magnetism?
Like poles repel opposites attract
