4.1 Flashcards
Q: What are the ends of a magnet called?
A: The ends of a magnet are called poles.
Q: How many poles does a magnet have?
A: Magnets have two poles: a north pole and a south pole.
Q: What does the Law of Magnetism state?
A: The Law of Magnetism states that two like poles repel each other, while two unlike poles attract each other.
Q: What happens when two magnets are held close together?
A: When two magnets are held close together, there will be an attractive or repulsive force between them depending on how they are arranged.
Q: What is an example of a non-contact force related to magnets?
A: The attraction or repulsion between two magnetic poles is an example of a non-contact force
Q: How can attraction and repulsion be shown by magnets?
A: Attraction and repulsion can be shown by the magnetic field patterns around bar magnets.
Q: What do the magnetic field lines look like for attracting and repelling bar magnets?
A: The magnetic field lines for attracting and repelling bar magnets form distinct patterns around the magnets.
Q: Which metals in the Periodic Table are magnetic?
A: The metals in the Periodic Table that are magnetic include iron, cobalt, and nickel.
Q: Why is steel considered magnetic?
A: Steel, being an alloy containing iron, is also magnetic.
Q: What happens when magnetic materials are brought close to a magnet?
A: Magnetic materials will always be attracted to the magnet, regardless of which pole is held close to it.
Q: How can you test whether a material is a magnet?
A: To test whether a material is a magnet, it should be brought close to a known magnet. If it can be repelled by the known magnet, then the material itself is a magnet. If it can only be attracted and not repelled, then it is a magnetic material.
Q: What are the two types of magnets?
A: The two types of magnets are permanent magnets and induced magnets.
Q: What are permanent magnets made of?
A: Permanent magnets are made out of permanent magnetic materials, such as steel.
Q: What happens when a magnetic material is placed in a magnetic field?
A: When a magnetic material is placed in a magnetic field, it can temporarily be turned into a magnet. This phenomenon is called induced magnetism.
Q: What occurs when magnetism is induced on a material?
A: When magnetism is induced on a material, one end of the material will become a north pole, and the other end will become a south pole
Q: How are induced magnets different from permanent magnets?
A: Induced magnets are temporary magnets, whereas permanent magnets retain their magnetism indefinitely.
Q: Why do magnetic materials always get attracted to a permanent magnet?
A: Magnetic materials always get attracted to a permanent magnet because the end of the material closest to the magnet will have the opposite pole to the magnet’s pole closest to the material.
Q: What is a magnetic field?
A: A magnetic field is the region around a magnet where a force acts on another magnet or on a magnetic material such as iron, steel, cobalt, and nickel.
Q: How are magnetic field lines used to represent a magnetic field?
A: Magnetic field lines are used to represent the strength and direction of a magnetic field. The direction is shown using arrows, and the strength is indicated by the spacing between the lines.
Q: What are the characteristics of a strong magnetic field?
A: A strong magnetic field is indicated by magnetic field lines that are close together.
Q: What rules must be followed when drawing magnetic field lines?
A: Magnetic field lines should always go from north to south, indicated by an arrow midway along the line. They must never touch or cross other field lines.
Q: Where is the magnetic field strongest around a bar magnet?
A: The magnetic field is strongest at the poles of the magnet, where the field lines are closest together.
Q: What is a uniform magnetic field?
A: A uniform magnetic field is one that has the same strength and direction at all points. This means there is equal spacing between magnetic field lines, and they all have arrows going from the north pole to the south pole
Q: How can the shape and direction of a magnetic field be investigated?
A: The shape and direction of a magnetic field can be investigated using plotting compasses. These compasses are like small bar magnets with a north and south pole.