why dont the electric lines of forces exist in a conductor. why is this not applicable for dielectric?

Answer 1

I assume you meant that why there's no electric flux density inside a (good) conductor?

first, it is derived from the First Maxwell's Equation / Gauss Law of Electric field.

second, in a good conductor the tangent loss is so high that there's no electric field can pass through a good conductor.

As an example in an elevator the signal of cellular coverage from a BTS cannot pass through the metal box, so we cannot receive any signal on our phone. Another example, on X-Ray checking in airport if you want to smugle things, you can cover them up by tin foil, because the electric field which used to scan won't pass it.

Why dielectric doesn't have the same phenomenon, it's because it has a low conductivity and high permitivity than the electric field easily infiltrate the dielectric materials.

In conductor case, the electric field trapped inside our outside the volume. And in quasi-conductor case, the field may penetrate in a certain depth called the skin depth.

Hope this help you.

Answer 2

electric lines of force exist between 2 or more points. a dielectric can split into numerous dipoles resulting in a dipole moment (thus enablic elctric lines of force to pass through) while such a thing does not happen in a conductor.

electric line of force nevre pass through the conductor. this can also be found by the "gauss law" as charge distributes uniformly over the surface of the conductor resulting in a zero electric field inside it.

Answer 3

If there was an electric field in conductor, it would mean that a current had to be flowing. You could have this happen, but you would have to be applying a voltage across the conductor. An external filed cannot penetrate the conductor since the current flow would be extracting energy from the field which makes no physical sense.

Answer 4

In conductors electrons can move, hence if electric field existed inside a conductor its electrons will move opposite to field and continue to move till field becomes zero.


Inside a charged or uncharged conductor ,the ELECTRIC FIELD IS ALWAYS EQUAL TO ZERO

(it is result from Gauss theorem)

As electric field lines represent electric field E and E does not exist inside a conductor ,hence ELECTRIC FIELD LINES DO NOT EXIST INSIDE A CONDUCTOR.

The ELECTRIC FIELD IS NOT EQUAL TO ZERO inside a dielectric


As E in dielectric exists,hence electric field lines exist in side a dielectric

Answer 5

Electrical field lines DO exists both in conductive and non-conductive environments: in conductors charged particles are moving due to it, in insulators potential electrical energy is stored due to it (capacitors).