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

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SUMMARY

The discussion focuses on the magnetic field strength and pattern rules for bar magnets when attached together. It concludes that when two bar magnets are joined with opposite poles (N/S), the resulting magnetic field is weaker than that of a single bar magnet. Specifically, the configuration where both magnets are aligned with the same poles (N/N or S/S) results in zero magnetic field due to the cancellation of induced currents. The answer to the posed problem is definitively D, not A, indicating a misunderstanding of the interaction between the magnets.

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pkc111
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TL;DR
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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