Comparison Between Electromagnets and Permanent Magnets

Electromagnets and Permanent Magnets:

ElectromagnetPermanent Magnet
(1) It is a temporary magnet- it ceases to exist as soon as the current passing through it is stopped.It does not lose its magnetism so quickly, that is why it is called a permanent magnet.
(2) The polarity can be reversed readily by reversing the direction of the current.The polarity of a permanent magnet cannot be reversed.
(3) The strength of the magnetic field produced by an electromagnet can be increased or decreased without bodily shifting the magnet, by adjusting the current.The strength of the magnetic field produced by a permanent magnet at a given point can not be changed without bodily shifting the magnet.
(4) An electromagnet can produce intense magnetic fields.A permanent magnet cannot produce a very strong magnetic field.

Heisenberg Uncertainty Principle
Vapour Pressure and Raoult’s Law
Imperfections or Defects in Solids
Primary Cells- Dry Cell and Mercury Cell
Theories of Chemical Kinetics
Protective Colloids and Gold Number
Artificial Transmutation of Elements
Crystal Field Theory or Ligand Field Theory
Heat Transfer and Solar Energy-NIOS

Comments (No)

Leave a Reply