1) Which picture shows a magnet attracting metal objects? a) b) c) d) 2) Which image illustrates an electromagnet? a) b) c) d) 3) What materials are attracted to magnets? a) Plastic b) Iron c) Glass d) Wood 4) Which part of a magnet is where the magnetic force is strongest? a) The middle b) The ends only c) The poles (North and SOuth) d) The entire surface equally 5) What do you need to make an electromagnet? a) A magnet and a battery b) Copper wire, a battery, and an iron core c) Steel and water d) A compass and a magnet 6) What happens when you turn off the electric current in an electromagnet? a) It loses its magnetic strength b) It becomes a permanent magnet c) It explodes d) It turns into a different metal 7) Which picture shows the magnetic field lines around a magnet? a) b) c) d) 8) Which picture shows a crane lifting heavy metal using an electromagnet? a) b) c) d) 9) What is a magnet field? a) The material inside a magnet b) The metal that is attracted by magnets c) The electric current flowing through a wire d) The area where magnetic forces can be felt 10) What is the main purpose of wrapping wire around an iron nail when making an electromagnet? a) To decorate the nail b) To insulate the nail c) To make the nail heavier d) To generate a magnetic field when electric current flows through the wire 11) True or False: Electromagnets can be turned on and off. a) False b) True 12) Which of the following is a real-world use for a permanent magnet? a) A junkyard crane that lifts cars b) An electric bell c) A refrigerator door seal d) An MRI machine 13) According to the rule of magnetic poles, a South pole will_____________a North pole. a) Repel b) Attract c) Destroy d) Ignore 14) Which picture shows that the two-bar magnets will repel each other? a) b) c) d) 15) Which picture shows the horseshoe magnets? a) b) c) d)

Magnet & Electromagnet Mastermind

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