hi,

see robotics engineering is now an emerging field in technology and with time to time the demand for robotics would grow. robotics engineering has concepts of electronics, some of the mechanical engineering and software engineering. however since this is an interdisciplinary stream you may go for robotics course in master program from any field of btech course. but I would recommend you to go for electronics and communication engineering since it would have wide concepts which needed for robotics engineering.

hope you may understand.