1.Write down the properties and the types of insulatingmaterials used in the construction of power and distributiontransformers.
2. What are the different types of magnetic materials?Distinguish between hard and soft magneticmaterials.     Â
3.Explain Hall effect, hall coefficient and its value indifferent semiconductor
4.Explain with graphical representation the variation ofmobility with temperature
5.Give the general electrical and magnetic characteristics offerrites. List its applications  Â
