Question: A cylindrical layer of dielectric with permittivity e is inserted into a cylindrical capacitor to fill up all the space between the electrodes. The mean

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

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