BAR MAGNET

                                          BAR MAGNET

BAR MAGNET

BAR MAGNET IS A COMPOSITE BODY THAT CONTAINS ALINED DOMAINS WHICH RESULTS IN THE FORMATION OF THE 2 EQUAL AND OPPOSITE POLES. EVERY MAGNET CONTAINS MAGNETIC DIPOLE MOVEMENT.

                                                                      M=m(2l)

   THIS FORMULA RESEMBLES THE EXPRESSION FOR ELECTRIC DIPOLE MOVEMENT.

PROPERTIES OF MAGNET

1. NORTH POLES OF EVERY BAR MAGNET WHEN SUSPENDED FREELY ALWAYS POINT TOWARD GEOGRAPHIC POLES NORTH AND THE SOUTH POLES TOWARDS THE GEOGRAPHIC SOUTH.

2. LIKE POLES REPEL EACH OTHER AND UNLIKE POLES ATTRACT EACH OTHER.                

3. MAGNETIC LINE GOES FROM NORTH TO SOUTH [OUTSIDE]. SOUTH TO NORTH [INSIDE] THEY ALWAY FORM A CONTINUOUS CLOSED LOOP.

4. WHEN WE CUT A MAGNET ALONG ITS AXIS ITS DIPOLE MOVEMENT IS IN HALF.

                                                                 M = M/2 (2l)

                  WHEN IT IS CUT WITH THE TRANSFERS AXIS IT BECOME 1/4

5. ALL THE MAGNET OBEYS COULOMBS LAW [IN MAGNET]

                                                   F = µ0/4π [m1m2/r2]

 6.MAGNETIC FIELD ON EQUATORIAL LINE PASSING THROUGH MAGNETIC DIPOLE.

7. MAGNETIC FIELD ON THE AXIAL LINE PASSING THROUGH MAGNETIC DIPOLE.

8. TORQUE EXPERIENCE BY THE MAGNETIC DIPOLE WHEN KEPT INSIDE THE MAGNETIC FIELD.

MAGNETIC FIELD LINES

THE MAGNETIC FIELD LINES ARE CALLED MAGNETIC LINES OF FORCE. THIS NOMENCLATURE IS AVOIDED SINCE IT CAN BE CONFUSING. UNLIKE ELECTROSTATICS THE FIELD LINES IN MAGNETISM DO NOT INDICATE THE DIRECTION OF THE FORCE ON A [MOVING] CHARGE.

PROPERTIES OF MAGNETIC FIELD LINES

1. A TANGENT DRAWN AT ANY POINT ON THEM TELLS US THE STRENGTH OF INTENSITY AT THAT POINT.

                                                 

                                                                  A BAR MAGNET

2. THE TWO LINES CAN NOT BE INTERSECT EACH OTHER BECAUSE IF SO THEN WE WILL HAVE 2 TANGENTS AT THE SAME POINT WHICH IS NOT POSSIBLE. 

                                                      

                                        A CURRENT-CARRYING FINITE SOLENOID

3. THEY ALWAY FORM CONTINUOUS CLOSE LOOPS WHICH ARE CALLED IMPERIAL LOOPS.

4. MORE THE LINES MORE THE STRENGTH AT THAT PLACE.

                                                                  ELECTRIC DIPOLE

5. THESE LINES ARE ALWAYS AT A 90 DEGREE ANGLE WITH THE SURFACE OF THE MAGNET.