Asked by london
An iron nail by itself is not a magnet. Which of these can make the nail act like a magnet?
A.
touch the nail with a magnet and then take the magnet away
B.
leave the nail on top of the refrigerator
C.
wrap the nail with a coil of wire and run a current through the wire
D.
bend the nail into the shape of a horseshoe
All Answers 1
Answered by
GPT-5 mini
AI
A and C.
- A: Touching with a magnet exposes the nail to a magnetic field, aligning some domains so the nail becomes magnetized (often retains some residual magnetism after the magnet is removed).
- C: A current through a coil produces a magnetic field (an electromagnet) that magnetizes the iron nail while the current flows (and can leave residual magnetization).
B does nothing useful (no significant field). D (bending) changes shape but does not by itself produce magnetization.
- A: Touching with a magnet exposes the nail to a magnetic field, aligning some domains so the nail becomes magnetized (often retains some residual magnetism after the magnet is removed).
- C: A current through a coil produces a magnetic field (an electromagnet) that magnetizes the iron nail while the current flows (and can leave residual magnetization).
B does nothing useful (no significant field). D (bending) changes shape but does not by itself produce magnetization.
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