Magnetism And Matter

Bar Magnet 

• It consists of a magnetic dipole.

• The two poles of a magnet point to the North and South Poles of the Earth when the magnet is suspended freely.

• Properties of magnetic poles:

  • Like poles repel each other and unlike poles attract each other.
  • They can never be separated.
• Magnetic length is the distance between the two poles of a magnet.
• Magnetic dipole moment is the product of either pole strength and magnetic length of a magnet.
• Magnetic dipole moment is a vector quantity. Its SI unit is joule/tesla or ampere-metre².
• A current-carrying coil behaves like a magnetic dipole whose one face represents the North Pole and the other face represents the South Pole.
• The magnetic moment of a current-carrying coil is given by M…