How Is the Force on a Helium Ion Calculated in a Magnetic Field?

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Homework Help Overview

The discussion revolves around calculating the force on a He2+ ion moving in a magnetic field, specifically focusing on the parameters of velocity and magnetic field strength.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the force equation for charged particles in a magnetic field but expresses uncertainty regarding the charge of the helium ion.
  • Participants explore the composition of a helium atom and its implications for determining the charge of the ion.

Discussion Status

Participants are actively discussing the charge of the He2+ ion, with some confirming the charge value. There is a focus on clarifying the underlying assumptions about the atomic structure of helium.

Contextual Notes

There is an ongoing exploration of the charge of the helium ion, with references to the atomic structure and the implications for the force calculation. The original poster's uncertainty about the charge indicates a need for further clarification on this aspect.

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Homework Statement


What is the magnitude of the force experienced by a He2+ ion traveling with v = 1.3 × 10^5i m/s in a magnetic field B = 0.42 j T?

Homework Equations


F=qvbsinθ

The Attempt at a Solution


F=2*1.6e-19*1.3e5*0.42

I am unsure about the charge on the Helium ion.

Is it 2*1.6e-19?
 
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Imagine a neutral He atom. Now strip off all the electrons. What is left? Two neutrons and two protons, so...
 
Geofleur said:
Imagine a neutral He atom. Now strip off all the electrons. What is left? Two neutrons and two protons, so...

So the charge is 2*1.6e-19?
 
Yep.
 

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