Is the Same Dynamical Theory of Electromagnetic Fields ... fileIs the Same Dynamical Theory of Electromagnetic Fields which Maxwell Thought is Taught today?Maxwell Thought is Taught
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Is the Same Dynamical Theory of Electromagnetic Fields which
Maxwell Thought is Taught today?Maxwell Thought is Taught today?
Rowdra GhatakAssociate ProfessorMicrowave and Antenna Research Laboratory, ECE DeptNational Institute of Technology Durgapur
Coulomb’s law state that the force F between two point charge Q 1 and Q 1 is1. Along the line joining them2 Directly proportional to the product Q 1 Q 12. Directly proportional to the product Q 1 Q 1
of the charges3. Inversely proportional to the square of the
Gauss’s law states that the total electric flux ψ through any close surface is equal to the total charge enclosed by the surfacetotal charge enclosed by the surface.
dvdsDQ v∫ ∫=•= ρ
∫ ∫=• vdsD ρ
s v∫ ∫
Karl F Gauss1777-1855D ρ=•∇
∫ ∫s v
P i t f f th G l 1777 1855vD ρ=•∇ Point form of the Gauss law
Biot-Savart’s law states that the magnetic field intensity dHmagnetic field intensity dHproduced at a point as shown in below by the differential current element Idl is proportional to the
d t Idl d th i f thproduct Idl and the sine of the angle α between the element and the line joining P to the element and is inversely proportional to
J B Biot1774-1862
F Savart1791-1841
y p pthe square of the distance R between P and the element.