Magnetism / Electromagntism Flashcards
How many poles does a magnet have
2
South and North
Do south and North attract or repel?
Do North and North attract or repel?
Do south and South attract or repel?
Attract
Repel
Repel
Name some magnetic metals:
Iron, steel, cobalt, nickel
Does a magnetic force get stronger or weaker the closer it is to a magnetic ?
Stronger
What is a magnetic field?
A magnetic field is where there is a force on a magnet or a magnetic material. You can draw lines called magnetic field lines to represent the field. The field lines are like elastic bands that try to straighten.
If the magnetic field lines are closer together, does this show that the magnetic field is stronger?
Yes if the lines are closer together the force is stronger.
Does the earth have a magnetic field? If so what is it?
Yes!
The Earth behaves as if there is a huge bar magnet inside there isn’t really a bar magnet and physicist aren’t sure what produces the Earth magnetic field people have used compasses which contain smaller magnets to navigate the world for years.
What does magnetism mean?
Magnetism is an invisible force that pushes or pulls magnetic material.
What is an electromagnet?
A electromagnet is a magnet with an iron core with coil wrapped around it. It runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it.
What type of material is used for an electromagnet?
Iron as it is easily magnetised but can lose its magnetism quickly
How do you make an electromagnet stronger?
Add more turns, loops of coil.
Make the current stronger.
Use a magnetic material for the core.
How does the strength of an electromagnet vary with distance?
The strength of magnet field around an electromagnet decreases with distance.
Can you switch an electromagnet on and off?
Yes
Is magnetism a noncontact or contact force?
Magnetism is a noncontact force
Is the magnetic force stronger or lower depending on how close you are to the poles?
Magnetic force is stronger the closer you are to the poles.
What happens if you turn off the electricity flowing into your soft iron core?
If you turn off the current flowing into the soft iron core the magnetic field will disappear.
What do you call a a soft iron call with lots of wires wrapped on it?
A solenoid
Why do we call the iron soft?
The iron court is often called a soft iron as it is magnetic soft. This means it is easy to magnetise and de magnetise.
