Why is the electric field in a capacitor after introduction of dielectric= (sigma -sigma p)/ epsilon .

Where sigma is surface charge density and sigma p is surface charge density of the polarised dielectric.

 

Asked by prakriti12oct | 4th Jul, 2019, 09:31: PM

Expert Answer:

Because the electric field E equals sigma over epsilon subscript 0 polarizes the dielectric as a result charges are induced on the surface of the dielectric which induces electric field E subscript P equals sigma subscript P over epsilon subscript 0. But the  induced electric field E subscript P equals sigma subscript P over epsilon subscript 0 is in opposite direction to the original electric field E. Therefore the net electric field is given by
E equals fraction numerator sigma minus sigma subscript P over denominator epsilon subscript 0 end fraction

Answered by Utkarsh Lokhande | 5th Jul, 2019, 09:16: AM