Electrical field outside a hollow spherical conductor

[Noelani2306]

Hello everyone,
There is an electrical field inside and outside (at the same time) the spherical hollow conductor when we place positive or negative charge inside, isn't it?

I know this is because of the induced charges on the inner and outer surfaces of the conductor. There is no field inside the conductor itself, but there are field lines "exiting" the positive part on the outer surface of the conductor which, consequently, makes the field exist outside of it.

But why does not this work in the reverse way?

Let me say this: when we place a charge (positive or negative) outside of the spherical conductor, or otherwise, when we place this conductor inside the field lines (External Field lines, i.e two parallel opposite charged plates, as an example), electirc field is not present inside the conductor itself again as in the previous case, but now, they do not enter the empty space inside...?

they skip the conductor again but not pass the conductor and present inside the shell? Why?

 

[Chandra Prayaga]

Let us look at your question step-by-step. Place the metal spherical hollow conductor in a uniform electric field inside a capacitor. If the elctric field penetrated into the hollow region, what would be the shape of the electric field lines inside the hollow?

 

[Noelani2306]

reverse to the outside electric field lines? i guess

Let us look at your question step-by-step. Place the metal spherical hollow conductor in a uniform electric field inside a capacitor. If the elctric field penetrated into the hollow region, what would be the shape of the electric field lines inside the hollow?

 

[Chandra Prayaga]

Remember that the electric field must be perpendicular to the metallic surface, in equilibrium. That will be so inside the hollow too.

 

[Noelani2306]

so what does it give to me? does this mean field don't penetrate ?

 

[Chandra Prayaga]

There are a couple of steps in the logic before you can come to a conclusion. First you should make a drawing of the field lines or arrows inside the hollow, keeping in mind that the electric field is perpendicular to the surface of the conductor.

 

[Noelani2306]

Ok thanks)))