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A 2.0 mm diameter glass sphere has a charge of +1.0 nC. What speed does an electron need to
orbit the sphere 1.0 mm above the surface? (Ans. 2.81×107 m/s)

  • Physics -

    So the electron is 2mm from the center.

    set coulombs force= centripetal force
    kQ1*e/r^2=m v^2/r
    solve for v

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