Science - Magnets

    Cards (19)

    • Magnets are invisible force that attracts or repels
    • Like poles repel
      Opposite poles attract
    • Magnets attracts; iron, nickel and cobalt
    • The strength of a magnet in units is called gauss or tesla
    • What are electromagnets?
      Electromagnets are temporary magnets that produce a magnetic field when an electric current flows through them.
    • How do electromagnets differ from permanent magnets?
      Electromagnets can be turned on and off by controlling the electric current, while permanent magnets always have a magnetic field.
    • What are the key points about electromagnets?
      • Temporary magnetic field
      • Requires electric current
      • Can be switched on and off
    • What are the three main components of an electromagnet?
      The three main components are the core, coil, and power source.
    • What is the function of the core in an electromagnet?
      The core provides a path for the magnetic field and is usually made of soft iron or steel.
    • What does the power source do in an electromagnet?
      The power source provides the electric current to energize the coil and create the magnetic field.
    • What factors influence the strength of an electromagnet?
      The strength depends on the number of turns in the coil, the amount of current flowing, and the material of the core.
    • How does the number of turns in the coil affect the strength of an electromagnet?
      More turns in the coil result in a stronger magnetic field.
    • What happens to the magnetic field when the electric current flows through the coil?
      It creates a magnetic field around the coil.
    • What occurs when the electric current is turned off in an electromagnet?
      The magnetic field collapses, causing the electromagnet to lose its magnetism.
    • What are the applications of electromagnets?
      1. Electric motors and generators
      2. Magnetic resonance imaging (MRI)
      3. Magnetic separation
      4. Lifting heavy objects
      5. Doorbells and speakers
    • What is the role of electromagnets in magnetic separation processes?
      They separate magnetic materials from non-magnetic ones.
    • In a recycling plant, why are electromagnets preferred over permanent magnets for separating metal from other materials?
      Electromagnets can be turned off to release the metal, making the sorting process more efficient.
    • What property of electromagnets is most useful for sorting recyclable materials?
      The ability to be turned on and off.
    • What is the relationship between the amount of current flowing through the coil and the strength of the magnetic field?
      The strength of the magnetic field is proportional to the amount of current flowing through the coil.
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