Magnets Flashcards
What is a magnetic field?
A part around a magnet where the effect of magnetism is felt.
Describe the earths magnetic field.
The earth’s magnetic field stretches all the way into space. It is a magnetic field that surrounds the earth, protecting us from harmful particles from space. The field is pretty unsteady.
Explain the difference between attraction and repulsion.
Attraction happens when the north pole of a magnet gets close to the south pole of another. (Opposites attract.) Repulsion happens when a north pole gets close to another north, or south to south. They push away from each other.
What is polarity?
Polarity is when something has two different poles and can attract and repel things.
Describe the domain of a magnetic object compared to a unmagnetized magnet.
The domain of a magnetized object is organized and arranged so that the magnetic fields align, making a magnetic field go in the same way. An unmagnetized objects domain is all arranged in random ways and it is arranged so that there is no magnetic field.
What is a ferromagnet?
Things with strong magnetic properties like iron and rare earth metals that can stay magnetized even without a field.
Explain magnet declination.
The angle between true north and magnetic north.
How do you create a magnet?
By exposing ferromagnetic things like iron and nickel to a magnetic field.
How do you demagnetize an object?
Drop it strike it or heat it.
What happens if you break a magnet into two pieces?
You will have another set of north and south poles.
Explain how an electric motor works?
It takes electrical energy and turns it into mechanical energy.
What is the difference between a temporary magnet and a permanent magnet?
A temporary magnet is where magnetism can be stopped. A permanent magnet has magnetism all the time and it never goes away.
