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Homework Help: Basic Force on Charge in B Field

  1. Sep 9, 2015 #1
    1. The problem statement, all variables and given/known data
    What is the magnitude of the force experienced by a He2+ ion travelling with v = 1.3 × 10^5i m/s in a magnetic field B = 0.42 j T?

    2. Relevant equations
    F=qvbsinθ

    3. 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?
     
  2. jcsd
  3. Sep 9, 2015 #2

    Geofleur

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    Imagine a neutral He atom. Now strip off all the electrons. What is left? Two neutrons and two protons, so...
     
  4. Sep 10, 2015 #3
    So the charge is 2*1.6e-19?
     
  5. Sep 10, 2015 #4

    Geofleur

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