Magnetising Iron Bar

#Magnetizing_Ironbar 

Magnetizing a Soft Iron Bar with the Strong Permanent Bar magnet

1. When Strong Permanent Bar magnet is away, all tiny magnetic dipoles in Fe are
   oriented in different directions, with out any alignment

2. When Strong Permanent Bar magnet approaches closely, all tiny magnets align 
   in the same direction of the Permanent magnet so that all S-pole directed towards
   the N-Pole

Gausse's theorem - Animation

# ELECTROSTATICS  #Gausses_theorem

Gauss's Law

Gauss's theorem in electrostatics states that the total electric flux through any closed surface is equal  1/ ε₀ times the net charge enclosed 

Electric field lines from a point charge. The charge is placed at the center of an imaginary sphere ( Gaussian Sphere). Electric field lines start from  positive charge at center and penetrates out through the surface of the sphere.  Here All lines ( 8 lines ) are passing perpendicular to the surface, so we can Count them for FLUX THROUGH THE SURFACE.  Here flux through the surface is 8