Undergrad What's the field strength and pattern rules for bar magnets attached?

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The discussion centers on the magnetic field strength and patterns when bar magnets are attached, specifically addressing configurations of N/S and N/N/S/S. It highlights that joining two bar magnets with opposite poles (N/S) results in a weaker magnetic field compared to a single magnet, leading to confusion about the expected outcomes. The conversation also questions the percentage loss in strength when magnets are combined and how the field lines would appear in different configurations. Additionally, it notes that connecting like poles (N/N or S/S) would lead to zero current due to cancellation of induced currents. Understanding these principles is crucial for grasping the behavior of magnetic fields in various configurations.
pkc111
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What are the field strength and pattern rules for bar magnets attached to each other?
The attached probem tricked me because the answer is apparently D and not A.
Presumably because the magnetic field is weaker with 2 bar magnets joined N/S compared to a single bar magnet.
So this seems to be a gap in my knowledge as to the resulting strengths of magnets joined together. Are there any rules. I assume the magnetic strength is not 0 for the magnets in A, so what % loss will there be? What will the field lines look like? What if they were tied the other way N/N and S/S?
Many thanks
 

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pkc111 said:
Summary:: What are the field strength and pattern rules for bar magnets attached to each other?

What if they were tied the other way N/N and S/S?
Double current wrt D will be observed.

Zero current will be observed for A. Opposite induced currents by the opposite polar magnets cancel.
 
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