How do you know a force if a force is radially symmetric?

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SUMMARY

A force is considered radially symmetric if it depends solely on the radial distance "r" and has only a radial component in the direction of "er". This means that the force remains constant at any point on a circle of radius "r". The discussion clarifies that a field is radially symmetric if it maps onto itself under rotations, indicating that the expression for the force remains unchanged regardless of the orientation of the coordinate axes. An example provided is the magnetic field around a current-carrying wire, which exhibits radial symmetry despite not pointing radially.

PREREQUISITES
  • Understanding of radial distance and vector components
  • Familiarity with the concept of symmetry in physics
  • Knowledge of rotational symmetry and its implications
  • Basic principles of electromagnetism, specifically magnetic fields
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  • Study the mathematical definition of radial symmetry in vector fields
  • Explore the concept of rotational symmetry in physics
  • Learn about the properties of magnetic fields around current-carrying conductors
  • Investigate applications of radial symmetry in various physical systems
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Students studying physics, particularly those focusing on mechanics and electromagnetism, as well as educators looking to clarify concepts of symmetry in force fields.

Elvis 123456789
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If a force only depends on a radial distance "r" and it only has a radial component in the "er" then is it radially symmetric? This pertains to some homework problem I have, but part of the problem is that I'm not exactly sure what is meant by "radially symmetric". I assume its asking if the force is the same at any point on a circle of radius "r". If the force only depends on "r" and its only in the radial direction then it would be radially symmetric, correct?
 
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Elvis 123456789 said:
If a force only depends on a radial distance "r" and it only has a radial component in the "er" then is it radially symmetric?
Yes.

This pertains to some homework problem I have, but part of the problem is that I'm not exactly sure what is meant by "radially symmetric". I assume its asking if the force is the same at any point on a circle of radius "r". If the force only depends on "r" and its only in the radial direction then it would be radially symmetric, correct?
It is radially symmetric if the field maps onto itself under rotations. It is likely, if this is the first you've heard the term, that the specific symmetry being considered is that rotating the coordinate axes makes no difference to the expression for force.
This is also called "rotationally symmetric".

Note:
1. the B field about a wire carrying a current is radially symmetric - even though it does not point in the radial direction.
2. there are different amounts of radial symmetry
 

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