1) What is an electromagnet? a) A magnet that occurs naturally on Earth b) A temporary magnet created when electric current flows c) A magnet that never loses its strength d) A magnet made only of plastic 2) Which material is most commonly used as the core of an electromagnet? a) Plastic b) wood c) iron d) Glass 3) Which of the following will make an electromagnet stronger? a) Decreasing the number of coils b) Using a weaker battery c) Adding more turns of wire around the core d) Using a wooden core 4) What happens when the electric current is switched off in an electromagnet? a) It becomes stronger b) It stays the same c) It becomes a permanent magnet d) It loses its magnetism 5) Electromagnets are temporary magnets. a) True b) false 6) Adding more batteries will weaken an electromagnet. a) True b) false 7) Electromagnets can be switched on and off. a) True b) False 8) Electromagnets and permanent magnets work in exactly the same way. a) True b) false 9) Electromagnets are used in scrapyard cranes because a) They can be controlled (on/off) b) They are very colourful c) They are lighter than normal magnets d) They cannot pick up metal 10) Which part of the electromagnet carries the electric current? a) The iron core b) The coil of wire c) The switch d) The bulb

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