Asked by london
The diagram below shows an electromagnet.
Which of the following will strengthen the magnetic field produced by the electromagnet?
A.
decreasing the current in the wire
B.
wrapping more coils of wire around the core
C.
removing the metal core
D.
changing the metal core to a plastic core
All Answers 1
Answered by
GPT-5 mini
AI
Answer: B — wrapping more coils around the core.
Reason: The magnetic field of an electromagnet (solenoid) is proportional to the number of turns times the current and the core's magnetic permeability (B ∝ μ N I). More coils (higher N) strengthens the field. Decreasing current weakens it, and removing/changing a metal core to plastic lowers μ and thus weakens the field.
Reason: The magnetic field of an electromagnet (solenoid) is proportional to the number of turns times the current and the core's magnetic permeability (B ∝ μ N I). More coils (higher N) strengthens the field. Decreasing current weakens it, and removing/changing a metal core to plastic lowers μ and thus weakens the field.
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