A cylindrical layer of dielectric with permittivity `epsilon` is inserted into a cylindrical capacit
Channel: Doubtnut
Date: 2020-08-16

A cylindrical layer of dielectric with permittivity `epsilon` is inserted into a cylindrical capacitor  to fill up all the space  between  the electrodes. The mean  radius  of the  electrodes equals `R`, the gap between them is equal  to `d`, with  `d lt lt R`. The constant voltage  `V` is applied  across the electrodes of the capacitor. Find the magnitude  of the electric force pulling the dielectric  into the capacitor.