Recent content by omar.abosamra

That was very helpful really. yes now i understand , thanks very much Okefenokee .

from where can i know the result of the LHD experiment?

if a di-electric was introduced to an electric field from the outside it would be polarized and the charge denisties would be as follows : **volume bounded charge density ( ρv ) = - div ( P ) **surface bounded charge density ( ρs ) = P . n where P is the polarization vector and n is the...

"interactions between polar materials and electric field" sorry typing error.polar materials are those who have a permanent dipole ( like water molecules ) but these dipoles doesn't appear on the macroscopic scale due to their random orientation , so what if this polar medium is subjected to...

i have took a basic course in fluid mechanics: Bernoulli equation states that: P + (1/2)*ρ*v^2 + ρ*g*h = constant where P is the pressure , ρ is the density , g is the garvitational acceleration and h is the distance from the center of the Earth , and that constant is our reference. that...

references: 1- the book: Fundamentals of applied electromagnetics ( by Dr. Fawwaz T. Ulaby ) 2- wikipedia

for perfect conductor : conductivity is considered infinity ( σ = infinity ) , but do u know what is conductivity ? 1-it is the ratio between conduction current density ( J ) and electric field ( E ) >> ( σ = J/E ) 2-but again , what is the conduction current density ( J ) >> it is the...