Magnetism & Matter

Magnetism & Matter

1. Basic Properties

   • 1.Attractive property                      2.Directive Property                      3.like poles repels and unlike poles attract                                  4.magnetic poles always exist in pairs

2. Magnetic Field

   • Space around the magnet where its influence can be experienced 

3. Magnetic Poles

   • Regions of apparently concentrated magnetic strengths in a magnet where the magnetic attraction is maximum 

4. Coulombs law

   • The force of attraction or repulsion between two magnetic poles is directly proportional to the product of their pole strength and inversely proportional to the square of the distance between them                                          

5. Magnetic dipole

   • An arrangement of two equal and opposite magnetic poles seperated by a small distance 

6. Magnetic dipole moment

   • The product of its pole strength and magnetic length 

7. Magnetic Field lines

   • The path along which a unit north pole would move if it is free to do so 
   • Properties
     • 1.never cross each other              2.are closed curves                      3.tangeant to the line of force gives the direction of magnetic field                                                4. relative closeness of lines of force gives the measure of strength of magnetic field

8. Magnetic field of a bar magnet

   • Axis
   • Equitorial

9. work done in rotating the dipole

10. Torque

11. Potential energy of the dipole

12. Gauss's law in magnetism

13. Elements of earths magnetic field

    • Magnetic Declination
      • Angle between the geographic meridian and the magnetic meridian.
    • Angle of dip / Magnetic Inclination
      • Angle made by the earth's total magnetic field with its horizontal component.
    • Horizontal Intensity
      • Horizontal component of earth's magnetic field.

14. Important terms to describe magnetic properties of materials

    • MAGNETISING FIELD
      • magnetic field in vacuum that induces magnetism 
    • MAGNETIC INDUCTION
      • The total magnetic field inside a material is the sum of the magnetising field and the addiotional field produced due to magnetisation of the material
    • MAGNETIC FIELD INTENSITY
    • INTENSITY OF MAGNETISATION
    • MAGNETIC PERMEABILITY
    • RELATIVE PERMEABILITY
    • MAGNETIC SUSCEPTIBILTY