If i am interested in product design (ipod, etc) which is more relevant
Product design----> Electronics/EC engineering, or else you can try for computer science/engineering (do not try IT as it doesn't come close to design of consumer electronics).
As for the differences between all these fields, it is simple - they all focus on a particular area. If you have the requisite marks, you can pick and choose based on your interest (and the institutes, of course).
CSE deals with "core" computer science and theory, as well as "core" (deep/lower level) programming and some applications.
IT deals with the industrial application of computer science. Hence the focus is on developing efficient applications. It is less theoretical than CS/CE/CSE is. And there is no significant difference between computer science, computer science and engineering, computer engineering in India.
In general 80% of syllabus is common between IT and CSE branches. The other 20% veers off towards core theory and computing skills for CSE and industrial regulations and user experience oriented skills for IT.
As far as jobs go, both streams get similar jobs. However, if I had to make a little distinction, I would say that IT is slightly better for a good job in our country, and CS/CSE/CE is preferred outside India (a few companies *do* prefer CS over IT, but they are not a lot in number). But with some work experience, it probably won't matter either way.
As for EEE vs. ECE---> I would advise you to go with whatever feels better to you based on institute/syllabi of the courses, the placements for both are quite good. Even though you may hear that ECE is better, it is not necessarily so (and btw Electrical companies prefer EEE students by a long shot, and EEE is also eligible for all the same jobs as ECE, so I'd actually say EEE is better since your "job scope" is higher).
Although I have some serious questions about how/why the industries are recruiting people in the fashion they do (for example, Instrumentation and Control engineering shares *a lot* of syllabus with EEE, and yet companies seem to prefer EEE to I&C despite both branches having highly similar skills), I will reserve them for some other time.