Right Hand Rule: Proton or Electron?

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SUMMARY

The discussion centers on the application of the Right Hand Rule (RHR) to determine whether a particle is a proton or an electron based on its motion in a magnetic field. The user initially concludes that the particle is an electron due to the direction of the force, but further clarification reveals that if the particle is positively charged, it must be a proton. The correct interpretation of the RHR indicates that the first finger represents velocity, the middle finger represents the magnetic field, and the thumb represents the force. This understanding is crucial for accurately identifying charged particles in magnetic fields.

PREREQUISITES
  • Understanding of the Right Hand Rule (RHR) in electromagnetism
  • Knowledge of particle charge properties (positive vs. negative)
  • Familiarity with magnetic force equations, specifically F = q(v x B)
  • Basic concepts of magnetic fields and their effects on charged particles
NEXT STEPS
  • Study the Right Hand Rule in detail, including its applications in various scenarios
  • Learn about the properties of protons and electrons, focusing on charge and behavior in magnetic fields
  • Explore the derivation and applications of the magnetic force equation F = q(v x B)
  • Investigate the role of magnetic fields in particle physics and their effects on different charged particles
USEFUL FOR

Students studying electromagnetism, physics educators, and anyone interested in understanding the behavior of charged particles in magnetic fields.

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Homework Statement


For this given diagram, determine whether the particle is a proton or an electron.
Diagram-2.jpg


2. The attempt at a solution
Considering at the point where it enters the material.
Using RHR, Velocity is downwards (First Finger), Field is outwards (Middle Finger), Thumb points left but the force is supposed to be to the right so it's an electron.


3. The Problem encountered
The answer says that it's a proton but how can that be. Am I doing my RHR correctly? Can someone explain how it works. Thanks in advance.
 
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Why is force supposed to be towards the right? You correctly found that v x B points left at the point where the particle enters the field. The force is F = q(v x B), so if the particle is positively charged, the force will be towards the left and the particle will be deflected towards the left. That's what happens in the picture, so it must be a proton. If q was negative, it would have been deflected towards the right.
 
For F=Bil, which fingers represent which part?

Is it first finger current, middle finger field and thumb is force?
 

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