See BTech Engineering physics is a good field of study but its not at all a good compatible choice to your Desire of Masters in Robotics. I would recommend you that you can go for the ECE as it has a lot of exposure to the coding and electronics. So it can be a good choice.

Electrical And Communication Engineering, also have a better job perspective compared to that of BTech Engineering Physics as well. So you can go for the course of ECE.

To know more about ECE, visit the link below:

https://www.careers360.com/courses/electronics-and-communication-engineering-course

To know more about Engineering Physics, visit the link below:

https://www.careers360.com/courses/engineering-physics-course

I hope this answer helps. All the very best for your future endeavors!