Gauss's law derivation, Amper's law derivation, Gauss's law of electric field, Gauss'law law of magnetic field, Gauss'law law of gravitation field, introduction to Gauss's law for a field, introduction to Amper's law for a field, Strokes law of vector field, IITJEE physics,NEET physics, 12th class physics. @basic maths and physics.