The effects of eddy currents,hysteresis loss and joules heating effect on transformers and ways to minimize the effects

Hi Ukoette, we can only give you pointers, not do your homework for you, if you have specific questions we can help but you have to do your work yourself.

With sweeping questions like this we will only link you to google and wikipedia, so it's easier for you to search yourself.. :)

If you have more specific questions, please feel free to ask them.