A feature of the old Google Drive was to be able to append &newcopy to the end of the URL. This would prompt the student to make a copy when you share a view-only link with that student. Unfortunately this feature no longer works with the new Google Drive.
New to Google Docs is the ability to replace the /edit at the end of the URL with /copy. This has the same functionality that the old feature had.
The /copy works with ALL types of documents: Sheets, Documents, Slides, and Draw!
Replace /edit with /copy
From the URL in the address bar, delete the /edit at the end of the link. (For a spreadsheet you will ALSO delete the #gid=#### to the right of the /edit.)
The URL on this Google Doc is
DELETE the /edit and replace with /copy
Notice when you click on the link it now prompts you to make a copy of the doc.