Which combination of a wire coil and a core would make the strongest
electromagnet?
A. 200 coils of bare wire around a hollow cardboard core
B. 200 coils of insulated wire around a steel bolt
C. 50 coils of insulated wire around a hollow cardboard core
D. 50 coils of bare wire around a steel bolt
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Ответ:
B.
Explanation:
200 coils of insulated wire around a steel bolt
Ответ: