by the mass of the magnet lifting the metal paper clips by the size of the magnet lifting the metal paper clips by the number of metal paper clips lifted by the magnet by the time the metal paper clips stay on the magnet
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A student sets up an investigation to test the strength of magnets. He has several magnets of different sizes, shapes, and masses. He uses the magnets to lift metal paper clips. How is the strength of a magnet defined in the investigation?
Possibilities:
- by the mass of the magnet lifting the metal paper clips
- by the size of the magnet lifting the metal paper clips
- by the number of metal paper clips lifted by the magnet
- by the time the metal paper clips stay on the magnet

by the number of metal paper clips lifted by the magnet