Student 1 will then test his object and pass the magnet to student 2 who will test his object, and so on.
(Student 1; will test; his object; T:then) (Student 1; pass; the magnet to student 2; T:then) (2; will test; his object)
Student 1 Student 1 2
will test pass will test
his object T:then
the magnet to student 2 T:then
his object