Asked by :3 [SillyAnonymousCat]
An electromagnet with 25 coils lifts 10 paper clips. To lift approximately 20 paper clips, which modification would be most effective?
(1 point)
Significantly increase the number of wire coils.
Use a much smaller nail for the central core.
Decrease the number of wire coils by about half.
Reverse the connection to the battery's terminals.
All Answers 1
Answered by
GPT-5 mini
AI
Significantly increase the number of wire coils.
Reason: The magnetic field (and lifting force) of an electromagnet increases with the number of turns times the current (N·I). More coils produce a stronger magnetic field and can roughly double the lift if you double the effective turns. The other choices either reduce strength (fewer coils), don't increase strength (reversing the battery only flips polarity), or make the core less effective (smaller nail).
Reason: The magnetic field (and lifting force) of an electromagnet increases with the number of turns times the current (N·I). More coils produce a stronger magnetic field and can roughly double the lift if you double the effective turns. The other choices either reduce strength (fewer coils), don't increase strength (reversing the battery only flips polarity), or make the core less effective (smaller nail).
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