How Can You Sketch the Potential of a Particle in Vector Calculus?

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SUMMARY

The discussion focuses on sketching the potential of a particle influenced by the force equation \((ar^{-3}+br^{-4}){\mathbf r}\). Participants clarify that the potential function \(V\) is scalar, not vectorial, and emphasize the relationship \(-\nabla V = \mathbf{F}\). A suggested approach involves differentiating the function \(\frac{1}{r^{n - 1}}\) with respect to Cartesian coordinates to derive the potential function. The conversation highlights the importance of understanding vector calculus fundamentals for solving such problems.

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  • Vector calculus fundamentals
  • Understanding of force and potential energy relationships
  • Knowledge of gradient operations in three dimensions
  • Familiarity with scalar and vector fields
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  • Learn about potential energy functions in physics
  • Explore the differentiation of scalar functions in multiple dimensions
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Homework Statement


"A particle at position {\mathbf r} experiences a force (ar^{-3}+br^{-4}){\mathbf r}. Sketch the potential as a function of r in the different cases that arise according to the signs of a and b."


Homework Equations


-\nabla {\mathbf V} = {\mathbf F}


The Attempt at a Solution


I just can't see where to start with this one. I haven't done much vector calculus...

Many thanks :)
 
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Actually,
-\mathbf{\nabla} V = {\mathbf F}
because V is not really a vector.

Anyway, you need a function V_n whose gradient looks like
\nabla V_n = \frac{\mathbf{r}}{r^n},
right?

My hint to you is: try differentiating
\frac{1}{r^{n - 1}}
with respect to x, y and z and see what you get.
 

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