How can you raise the pitch of note of a certain veena string without changing the length?

To raise the pitch of a note on a veena string without changing its length, you can increase the tension of the string. This can be achieved by tightening the tuning pegs, which pulls the string taut and raises its pitch. Additionally, you can use lighter gauge strings, which naturally have a higher pitch for the same length and tension. However, it's important to ensure that the string can handle the increased tension to avoid breaking.