Physics Electromagnetism Flashcards
how to find the magnetic field around a bar magnet using iron filings?
- place a piece of people in top of a bar magnet
- sprinkle iron filings on top of paper
- tap the paper to show the magnetic field lines
How to find the magnetic field around a bar magnet using a compass?
- on a piece of paper, draw around the bar magnet
- place a plotting compass near the magnet and mark north and south. draw a line between north and south marks
- repeat to show the magnets field
3 rules for drawing magnetic field lines
- draw at least 3 lines
- field lines CANNOT cross
- field lines go from N —> S
3 magnetic metals?
iron, cobalt, nickel
what is a permanent magnet?
a magnet where all the domains align
What is the magnetic field between opposite poles?
Straight, parallel, uniform field lines
if a current goes into you, which direction do the field lines go around
anticlockwise
if a current goes away from you, which direction do the field lines go around
clockwise
what is current going into you equivalent for in a wire
around a wire carrying current out of the page
what is current going away from you equivalent to in a wire?
around a wire carrying current into of the page
When is an electromagnet formed?
When a current carrying wire is wrapped around an iron core
what are electromagnets used in?
scrap yards and washing machine doors
what does the iron core do to the electromagnet?
makes it stronger, due to the current flowing through the wire
how does a magnetic compass show that the earths core is magnetic?
as it contains a small bar magnet, and the needle of the compass points in the direction of the earths magnetic field
The ? magnet induces/? temporary poles in the magnetic ? and these align so the ? material is attracted to the permanent ?
permanent, creates, material, magnetic, magnet
if the North Pole of the magnet is next to the magnetic material, what will be induced in the part of the material closest to the magnet?
a south pole as it has to be attracted to the North Pole
what is magnetism?
the ability of magnets to attract and repel other magnets without touching them
what is magnetism?
the ability of magnets to attract and repel other magnets without touching them
what are induced magnets??
magnetic materials that become magnetic/magnets when they are in a magnetic field but when moved away, they stop being magnets
how can and can’t magnetic materials interact with a magnet
they can be attracted, but not repelled
what will never be attracted to magnets
non magnetic materials
2 features of permanent magnets
- are always magnetic
- produce their own magnetic field
2 features of permanent magnets
- are always magnetic
- produce their own magnetic field
what is a solenoid?
a loop of wife coiled into a cyclindrical shape