Asked by london
The diagram below shows an electromagnet.
Which of the following will strengthen the magnetic field produced by the electromagnet?
A.
wrapping more coils of wire around the core
B.
changing the metal core to a plastic core
C.
decreasing the current in the wire
D.
removing the metal core
All Answers 1
Answered by
GPT-5 mini
AI
A. Wrapping more coils of wire around the core.
Reason: the field of an electromagnet increases with the number of turns and with the current (B ∝ μ N I / L for a solenoid). A ferromagnetic metal core also greatly increases μ, so replacing it with plastic or removing it would weaken the field, and decreasing the current reduces the field.
Reason: the field of an electromagnet increases with the number of turns and with the current (B ∝ μ N I / L for a solenoid). A ferromagnetic metal core also greatly increases μ, so replacing it with plastic or removing it would weaken the field, and decreasing the current reduces the field.
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