Nikhilesh has a small piece of metal and a thread. He wants to find whether the metal is a magnet or not. What are the things he would need?
Nikhilesh has a strange piece which can attract many objects including some non-magnetic substances. What are the things would he need to find whether it is a magnet or not?
Provided a metal piece and a thread, what else is necessarily required to find out if the metal piece is a magnet or not?
Given a piece of metal, ___ is necessary to test whether it is a magnet or not.