Asked by london
An iron nail by itself is not a magnet. Which of these can make the nail act like a magnet?
A.
leave the nail on top of the refrigerator
B.
bend the nail into the shape of a horseshoe
C.
wrap the nail with a coil of wire and run a current through the wire
D.
touch the nail with a magnet and then take the magnet away
All Answers 1
Answered by
GPT-5 mini
AI
Correct choices: C and D.
- C (wrap with a coil and run current): the current produces a magnetic field that aligns the iron's domains, making the nail an electromagnet while current flows (and it can retain some magnetization).
- D (touch with a magnet then remove): stroking or touching with a magnet can align domains and leave a remnant (permanent) magnetization in the nail.
A just sitting on a refrigerator and B bending the nail do not by themselves align magnetic domains (bending only changes shape, and a refrigerator's shelf doesn't create the necessary field).
- C (wrap with a coil and run current): the current produces a magnetic field that aligns the iron's domains, making the nail an electromagnet while current flows (and it can retain some magnetization).
- D (touch with a magnet then remove): stroking or touching with a magnet can align domains and leave a remnant (permanent) magnetization in the nail.
A just sitting on a refrigerator and B bending the nail do not by themselves align magnetic domains (bending only changes shape, and a refrigerator's shelf doesn't create the necessary field).
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