6 Magnetism Flashcards
What are the ends of a bar magnet called?
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north pole and south pole
In which region around a bar magnet is the magnetic field the strongest? How can the magnetic field lines indicate this?
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The magnetic field is strongest at the poles, the field lines are close together at the poles indicating a stronger field.
How can you create a uniform field using two bar magnets?
Place the bar magnets so that the N pole of one magnet is facing the S pole of the other.
Move them so that they are close but not touching
There is a uniform field between the poles
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Describe the magnetic field created when the N-pole of one bar magnet is near the S-pole of another.
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Uniform field
Magnetic field lines are parallel AND evenly spaced
What is a magnetic field?
A region of space where a magnetic material experiences a force.
Name a metal which is magnetically hard.
Steel
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Name a metal which is magnetically soft
iron
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What is the point called between two adjacent N-poles of a magnet where their magnetic field cancels?
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neutral point
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What is the law of magnetism?
Like poles repel
Unlike poles attract
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What is the difference between the domains in a magnetically hard material and a magnetically soft material?
Magnetically hard- difficult for domains to align in a field (also difficult for domains which are lined up to de-align)
Magnetically soft- easy for domains to align in a magnetic field and then de-align when field is removed.
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What is a permanent magnet made of? Magnetically hard material or magnetically soft?
Magnetically hard- so that it does not lose its magnetism easily
How can you observe THE SHAPE of a magnetic field around a magnet?
- Pace paper over top the magnet
- Sprinkle iron filing on the paper
- Tap the paper to help the iron filings line up in the field
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What happens when an iron nail is brought near the N Pole of a magnet.
The nail is attracted to the N-pole
The domains in the iron nail line up (point away) in the field creating a S-pole at the top of the nail closest to the magnet. (Magnetism is induced in the iron nail)
Opposite poles attract and the nail sticks to the magnet.
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What is the difference in the orientation of the domains in a magnetised and demagnetised material?
Magnetised- domains are lined up
De-magnetised- domains are randomly arranged
![](https://s3.amazonaws.com/brainscape-prod/system/cm/340/961/584/a_image_thumb.jpg?1527661610)
How can you show the shape AND direction of a magnetic field around a magnet?
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- place a magnet on a piece of paper
- place a plotting compass at one corner of the N-pole of the magnet
- draw a dot where the compass is pointing.
- move the compass forward so that the tail is adjacent to the point you just plotted
- draw another dot where the compass is pointing
- Continue this until you reach the S-pole and connect the dots with a smooth curve.
- Repeat steps 3-6 drawing multiple field line around the magnet
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