solve a,b and c please. In a concentric spherical electrode system, the outer radius is 15cm, the perforation of the insulator between the spheres since its resistance is 90 kV / cm, a) Obtain the equation for the breakdown voltage. b) Since 300kV is applied between the electrodes, r1 (inner radius) can be taken to prevent piercing of the system. what range are the values? c) What is the maximum voltage value that the system can withstand?

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Dielectric Breakdown

A dielectric is a material with low electrical conductivity and so is classified as an insulator. Dielectric materials are used to block the flow of electricity through them, allowing them to behave as an insulators. They can also be used to store electric charge or improve capacitance.Dielectrics have no free electrons for conduction because electrons are tightly bound to the nucleus. Because dielectrics contain a small number of electrons for electrical conductivity, they have a dipole. The two primary roles of dielectrics in electrical devices are insulation and electrical energy storage. An electric field polarizes the dielectric, and the polarization of the molecules allows dielectric materials to store charge.