8th Class Science Magnetism NCERT Summary - Magnet

NCERT Summary - Magnet

Category : 8th Class

Magnet

 

  • A magnet is an object or a device that gives off external magnetic field.
  • Basically, it applies a force over a distance on other magnets, electrical currents, beams of charge, circuits, or magnetic materials.
  • The magnetic field of an object can create a magnetic force on other objects with magnetic fields. That force is what we call magnetism.
  • When a magnetic field is applied to a moving electric charge, such as a moving proton or the electrical current in a wire, the force on the charge is called Lorentz force.
  • Magnets have two poles, called the north (N) and south (S) poles. Two magnets will be attracted by their opposite poles, and each will repel the like pole of the other magnet.
  • Repulsion: When two magnetic objects have like poles facing each other, the magnetic force pushes them apart.
  • A magnetic field consists of imaginary lines of flux coming from moving or spinning electric circuit.
  • Examples include the spin of a proton and the motion of electrons through a wire in an electric circuit.
  • Magnets also strongly attract Ferro-magnetic materials such as iron, nickel and cobalt.

 

Magnetism

  • A magnetic field consists of imaginary lines of flux coming from moving or spinning electrically charged particles. Examples include the spin of a proton and the motion of electrons through a wire in an electric circuit.
    • Magnetism is the force exerted by magnets when they attract or repel each other. Magnetism is caused by the motion of electric charges.
  • In most substances, equal numbers of electrons spin in opposite directions, which cancel out their magnetism. That is why materials such as cloth or paper are said to be weakly magnetic. In substances such as iron, cobalt and nickel, most of the electrons spin in the same direction. This makes the atoms in these substances strongly magnetic, but they are not yet magnets.
  • A magnet is an object that exhibits a strong magnetic field and will attract materials like iron to it. Magnets have two poles, called the north (N) and south (S) poles. Two magnets will be attracted by their opposite poles and each will repel the like pole of the other magnet.

 

Magnetic field

  • A magnetic field consists of imaginary lines of flux coming from moving or spinning electrically charged particles. Examples include the spin of a proton and the motion of electrons through a wire in an electric circuit.

 

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Notes - Magnet


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