Centre of Curvature: Turning Point or Centre?

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SUMMARY

The discussion centers on the concept of the centre of curvature in relation to the deflection of a proton in a magnetic field. It clarifies that the force acting towards the centre of curvature indicates the direction of acceleration, which is perpendicular to the tangent of the curve. The centre of curvature is defined as the center of the circle that best fits the curve at a specific point, illustrating the geometric relationship between the curve and its curvature. This understanding is crucial for interpreting the motion of particles in magnetic fields.

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  • Understanding of basic geometry concepts, particularly curvature
  • Familiarity with the motion of charged particles in magnetic fields
  • Knowledge of the relationship between force and acceleration
  • Basic principles of calculus related to curves and tangents
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A proton is deflected by a magnetic field, and curves away.

It states that just before it curves, the force acts towards the centre of curvature. Is this the point where it turns, i.e. the turning point of the parabola, or the centre being like the centre of a circle?
 
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Hi songoku! :smile:
Masafi said:
It states that just before it curves, the force acts towards the centre of curvature. Is this the point where it turns, i.e. the turning point of the parabola, or the centre being like the centre of a circle?

ah, this is geometry :wink:

the centre of curvature of any curve (at a particular point) is the centre of the circle that "best fits" the curve at that point …

imagine blowing up a balloon that sits on the curve: eventually it will become so big that it can't still touch the curve at that point: just before that happens, the balloon has the same radius of curvature as the curve, and the centre of curvature is the centre of the balloon. :smile:

(so "towards the centre of curvature" simply means perpendicular to the tangent, on the concave side of the curve :wink:)​
 

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