18. Derive an expression for the capacitance of parallel plate capacitor with a dielectric slab between its plates.

Asked by nilesh gangwani | 29th Nov, 2010, 10:43: AM

Expert Answer:

Dear student

Effect of Dielectric on the Capacitance of a Capacitor

We know that the effect of completely filling the space between the plates of a capacitor with a difference is to increase the capacitance to   C  =  K Co  where K is the dielectric constant of the dielectric .

For a parallel plate capacitor ,

              C  =  K    =  

Here   = K is the permittivity of the dielectric .

If a dielectric slab of thickness 't' and dielectric constant K is introduced between the plates of a capacitor as shown in figure , the capacity is given by 

             C  =  .






We hope this clarifies your doubt.




Answered by  | 29th Nov, 2010, 11:09: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.