3. The Varley loop test is used to find the position of an earth fault on a line of length 40 km. The resistancc/km of a single line is 28 2. The fixcd resistors have resistances of 250 2 cach. The fault is calculated to be 7 km from the test end. To what value of resistance was the variable resistor set? [1848 Q] TECT

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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.