38. What materials are needed to make an electromagnet?
A. Battery, wire, magnet, iron core
B Battery, wire, iron core, and switch
C Battery, wire, light bulb and a switch
D. Battery, wire, wooden rod and electric tape
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38. What materials are needed to make an electromagnet?
A. Battery, wire, magnet, iron core
B Battery, wire, iron core, and switch
C Battery, wire, light bulb and a switch
D. Battery, wire, wooden rod and electric tape
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Verified answer
Answer:
B.
Explanation:
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