Which combination of a wire coil and a core would make the strongest electromagnet?
A. 90 coils of bare wire around a hollow cardboard core
B. 50 coils of bare wire around a steel bolt
C. 50 coils of insulated wire around a hollow cardboard core
D. 90 coils of insulated wire around a steel bolt

Ask your question to the AI advisor

Ai-bot is an expert in any field and is the perfect companion for reliable and useful answers and advice on a variety of topics, including science, history, technology, art, sports, health, culture and more.