Describing Magnets
100 Points: What materials do magnets attract?
Answer: Iron, cobalt, and nickel.
100 Points: What is the term used for the push or pull exerted by magnets?
Answer: Magnetic force.
100 Points: What instrument is used to find north?
Answer: A compass.
100 Points: What is an electromagnet?
Answer: A coil of wire around an iron core that uses electric current to generate a magnetic field.
100 Points: What is electromagnetic induction?
Answer: The generation of current by a changing magnetic field.
200 Points: Explain what happens when a magnet is cut in half.
Answer: Each half will still be a magnet with a north and south pole.
200 Points: What is a noncontact force?
Answer: A force that acts at a distance without physical contact, like magnetic force.
200 Points: How does electric current affect a compass needle?
Answer: Electric current generates a magnetic field that can change the direction of the compass needle.
200 Points: Why does increasing the electric current in an electromagnet make it stronger?
Answer: More charge movement increases the magnetic field's strength.
200 Points: How does the speed of a magnet's movement affect the current in a wire?
Answer: A faster movement generates more current due to a larger change in the magnetic field.
300 Points: Why do iron nails attract to magnets but not to each other?
Answer: D. The magnetic domains are randomly oriented when the nails are not near a magnet.
300 Points: What happens to the strength of a magnetic force when the distance between two magnets increases?
Answer: The strength of the magnetic force decreases.
300 Points: What is electromagnetism?
Answer: The interaction between electricity and magnetism.
300 Points: How do the loops of wire in a solenoid affect the magnetic field?
Answer: More loops concentrate the magnetic field into a smaller area, making it stronger.
300 Points: What factors affect the amount of current displayed on an ammeter?
Answer: A. The number of loops in the solenoid, B. The speed of the magnet’s movement, C. The magnet used.
400 Points: Describe how the magnetic force operates between two magnets that are not touching.
Answer: The magnetic force is a noncontact force that acts at a distance.
400 Points: When discussing magnet interactions, what do we call the two ends of a magnet?
Answer: North pole and south pole.
400 Points: What happens to the magnetic field when electric charges move?
Answer: A magnetic field is generated around the moving charges.
400 Points: What role does the iron core play in an electromagnet?
Answer: It amplifies the magnetic field generated by the current in the wire.
400 Points: Why does increasing the number of loops in a wire increase the induced current?
Answer: More loops mean more wire is affected by the change in the magnetic field.
500 Points: What causes materials like iron to become magnets when exposed to a magnetic force?
Answer: The magnetic domains align due to the magnetic field, temporarily making it a magnet.
500 Points: How can we predict the strength of a magnetic force?
Answer: It varies in predictable ways depending on distance and the material involved.
500 Points: Explain how a solenoid works.
Answer: A solenoid is a coil of wire that generates a concentrated magnetic field when electric current runs through it.
500 Points: Describe how changing the shape of wire affects the magnetic field.
Answer: The shape of the wire can change the configuration of the magnetic field, affecting its strength and direction.
500 Points: How can a current be induced in a wire?
Answer: By either moving a magnet near the wire or moving the wire through a magnetic field.