1. A bar magnet has two magnetic poles, a north pole at one end and a south pole at the other end. If the magnet were cut in half, which of the following would describe the magnetic poles of the resulting two pieces?
Answer: B
Each piece would have both a north and a south pole.
When a bar magnet is cut in half, each resulting piece will have its own north and south pole. This is due to the fundamental nature of magnetic poles, which are always found in pairs.
A) One piece would have a north pole only and the other piece would have a south pole only.
This option is incorrect because cutting a magnet does not result in one piece having only a north pole and the other only a south pole. Instead, the division of the magnet creates two smaller magnets, each possessing both poles.
B) Each piece would have both a north and a south pole.
This is the correct option. When a bar magnet is halved, the magnetic field lines reorganize, and each half becomes a complete magnet with its own north and south poles, maintaining the dipole nature of magnetism.
C) One piece would have both a north and a south pole, and the other piece would not have any magnetic poles.
This option is incorrect because both pieces of the magnet retain their magnetic characteristics. Each piece, regardless of size, will contain both a north and a south pole after being cut.
D) Neither piece would have magnetic poles.
This option is false as well. Both halves of the magnet will continue to exhibit magnetic properties, meaning each half will still have distinct north and south poles.
Conclusion
The correct answer is option B because each piece of the cut magnet retains its characteristic of being a magnetic dipole. All other options fail as they incorrectly suggest that cutting the magnet would eliminate or alter the presence of magnetic poles in either piece. This reinforces the principle that magnets always exist as dipoles, regardless of their size.