Instrumentation I

A capacitive transducer is made up of two concentric cylindrical electrodes. The outer diameter of the inner electrode is 3mm and the dielectric medium is air. The inner diameter of the outer electrode is 3.1 mm. Calculate the dielectric stress when a voltage of 100V is applied across the electrode. Is it within the safe limit? The length of the electrode is 20mm. Calculate the change in capacitance if the electrode is moved through a distance of 2mm. The breakdown strength of air is 3KV/mm.