Find the capacitance of a capacitor, if it is made up of 120 sheets of paraffined paper 0.1 mm thick, interspaced with aluminium foil sheets of `5 cm xx 3` cm dimensions.
In what range of voltages can such a capacitor work?

Explanation

The aluminium foil sheets are connected alternately to form a system of capacitors connected in parallel (Fig. 25.3). The number of capacitors is equal to the number of dielectric layers.
The breakdown voltage is `U_(bn)=E_(m)d`, so the working voltage is chosen to be 1/3 to 1/2 of this