Problem in orienting two plates as instructed in question

[ehild]

Sorry

?
You can move away the bases of the cylinder to a longer distance, still the same field line will cross them. The flux does not depend on the length of the cylinder.

 

[gracy]

But from where is cylinder coming up?We were talking about plane/plate,right?

 

[ehild]

But from where is cylinder coming up?We were talking about plane/plate,right?

And applying Gauss' Law.

 

[gracy]

I know electric field due to uniformly charged infinite plane sheet is E=σ/(2ε0).Is this formula applicable always whether the sheet is conducting or non conducting?

 

[jbriggs444]

I know electric field due to uniformly charged infinite plane sheet is E=σ/(2ε0).Is this formula applicable always whether the sheet is conducting or non conducting?

If a uniformly charged sheet is infinite then, by symmetry, the component of the electric field parallel to the plate is zero everywhere. It does not matter whether the plate is conductive or not -- uniformly distributed charge will not flow to become non-uniform.

 

[gracy]

It does not matter whether the plate is conductive or not -- uniformly distributed charge will not flow to become non-uniform.

So I can use the formula E=σ/(2ε0) in conducting as well as non conducting sheet,right?

 

[gracy]

So I can use the formula E=σ/(2ε0) in conducting as well as non conducting sheet,right?

please say "yes"

 

[gracy]

The superposition principle says that you can calculate the resultant field of several objects separately, as if the other objects were not there, and then sum the individual fields.

The why when dielectric is placed between the plates of capacitor there is decrease in electric field between the plates?

 

[ehild]

The why when dielectric is placed between the plates of capacitor there is decrease in electric field between the plates?

Decrease with respect to what?

 

[gracy]

Decrease with respect to what?

I meant electric field between the plates is less when dielectric is placed between them than when it is not.

 

[ehild]

I meant electric field between the plates is less when dielectric is placed between them than when it is not.

Supposing the capacitor is connected to a battery. You insert dielectric between the plates.What happens to the electric field?

 

[cnh1995]

I meant electric field between the plates is less when dielectric is placed between them than when it is not.

It happens because of the dielectric polarization. If instead of a dielectric, there were a conducting material, all the field would vanish.