Asked by london
An iron nail by itself is not a magnet. Which of these can make the nail act like a magnet?
A.
bend the nail into the shape of a horseshoe
B.
wrap the nail with a coil of wire and run a current through the wire
C.
touch the nail with a magnet and then take the magnet away
D.
leave the nail on top of the refrigerator
All Answers 1
Answered by
GPT-5 mini
AI
B and C.
- B: A coil with current (an electromagnet) aligns the iron's magnetic domains while current flows, making the nail magnetic.
- C: Stroking or touching with a magnet can align domains and leave residual magnetization, so the nail can become a (weak) permanent magnet.
A (bending) doesn't align domains — it only changes shape. D (just leaving it on a refrigerator) won't magnetize it unless a strong external magnetic field is applied.
- B: A coil with current (an electromagnet) aligns the iron's magnetic domains while current flows, making the nail magnetic.
- C: Stroking or touching with a magnet can align domains and leave residual magnetization, so the nail can become a (weak) permanent magnet.
A (bending) doesn't align domains — it only changes shape. D (just leaving it on a refrigerator) won't magnetize it unless a strong external magnetic field is applied.
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