Magnetism

Electromagnets and applications

Basics of Electromagnets

  1. An electromagnet is a type of magnet created by passing an electric current through a coil of wire.
  2. The magnetic field is produced by the electric current, and it disappears when the current is stopped.
  3. The strength of an electromagnet depends on the number of turns in the coil, the current passing through it, and the presence of a ferromagnetic core.
  4. Electromagnets are temporary magnets, unlike permanent magnets.
  5. The dir

Earth’s magnetism, magnetic declination, and dip

Earth's Magnetism

  1. Earth behaves like a giant magnet with a magnetic field generated by the movement of molten iron and nickel in its outer core.
  2. The Earth's magnetic field protects us from solar wind and harmful cosmic radiation.
  3. The magnetic field is strongest near the magnetic poles and weakest near the equator.
  4. The geomagnetic field resembles that of a dipole tilted by about 11 degrees from the Earth's rotational axis.
  5. Magnetic field lines eme

Magnets, magnetic field, magnetic lines of force

Magnets

  1. A magnet is an object that generates a magnetic field and can attract ferromagnetic materials like iron, nickel, and cobalt.
  2. Natural magnets are naturally occurring substances like magnetite, while artificial magnets are man-made.
  3. Magnets have two poles, north and south, where the magnetic force is strongest.
  4. Like poles repel each other, and unlike poles attract each other.
  5. Magnets can lose their magnetism through
Magnetism