1) True or False? Less coils create a stronger electromagnet. a) True b) False 2) True or False? An electromagnet cannot be turned on or off. a) True b) False 3) True or False? Electromagnets are used in headphones. a) True b) False 4) True or False? The strength of an electromagnet cannot be changed. a) True b) False 5) True or False? Junkyard craned use permanent magnets, not electromagnets. a) True b) False 6) True or False? Earbuds use permanent magnets, not electromagnets. a) True b) False 7) True or False? A simple electromagnet can be made from an iron nail, a battery and a copper wire. a) True b) False 8) True or False? Magnetic fields form a circle. a) True b) False 9) True or False? MRI (Magnetic Resonance Imaging) machines use electromagnets, not permanent magnets. a) True b) False 10) True or False? Magnetic fields produced by an electrical current cannot have their direction reversed. a) True b) False

Electromagnets - Quiz!

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