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

In summary, the conversation discusses a problem where the answer is D instead of A, due to the weaker magnetic field when two bar magnets are joined N/S compared to a single bar magnet. The person is unsure about the rules for the resulting strength and pattern of magnets joined together. They also inquire about the field strength and pattern if the magnets were tied N/N and S/S. It is mentioned that there will be a double current for D and zero current for A, as the opposite polar magnets cancel each other out.
  • #1
pkc111
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TL;DR Summary
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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  • #2
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.
 
Last edited:

1. What is the field strength of a bar magnet?

The field strength of a bar magnet is a measure of the force exerted by the magnet on other magnetic materials. It is typically measured in units of tesla (T) or gauss (G).

2. How is the field strength of a bar magnet determined?

The field strength of a bar magnet is determined by the strength of its magnetic poles. The stronger the poles, the higher the field strength. It can also be calculated by dividing the magnetic dipole moment of the magnet by the volume of the magnet.

3. What are the field pattern rules for bar magnets?

The field pattern of a bar magnet is characterized by the presence of two magnetic poles, a north pole and a south pole. The field lines always flow from the north pole to the south pole, forming a closed loop. The field lines are also closer together near the poles and farther apart near the center of the magnet.

4. How does the orientation of a bar magnet affect its field pattern?

The orientation of a bar magnet affects its field pattern by changing the direction of the magnetic field lines. When the magnet is oriented with its north pole facing north, the field lines will flow from the north pole to the south pole in a horizontal direction. If the magnet is flipped, the field lines will flow in the opposite direction.

5. Are there any exceptions to the field pattern rules for bar magnets?

Yes, there are some exceptions to the field pattern rules for bar magnets. In rare cases, a bar magnet may have multiple poles or unevenly distributed poles, resulting in a more complex field pattern. Additionally, external magnetic fields can also influence the field pattern of a bar magnet.

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