BMAT Physics (Magnetism) Review Questions and Answers

What are the two poles of magnets called? north and south What is a magnetic field? an area where magnetic materials experience a force Give 4 magnetic materials: iron, steel, nickel, cobalt Is magnetism a contact or non-contact force? non-contact Fill the gap: the closer the magnetic field lines, the ________ the magnetic field stronger Where is the magnetic field the strongest? at the poles What direction do magnetic field lines point? north to south Fill in the gaps: two like poles ______ while two unlike poles _______ repel, attract What is a magnetically hard material? a material that can be permanently magnetised What is a magnetically soft material? a material that can only be temporarily magnetised Give examples of a magnetically soft material: alloys of iron, nickel and cobalt What is a permanent magnet? a magnet that produces its own magnetic field What is an induced magnet? A material that becomes a magnet when it is placed in a magnetic field True or false: the force between permanent and induced magnets is always attractive true What happens when an induced magnet is removed from a magnetic field? it loses its magnetism and stops producing a magnetic field What happens when current flows through a wire in regards to magnetism? a magnetic field is created around the wire