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F B

Learn how a velocity selector works with magnetic and electric fields to manipulate electron motion. Solve for magnitude and direction.

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  1. A velocity selector consists of magnetic and electric fields. The magnetic field is described by the expression . If B = 0.015 T find the magnitude and direction of such that an electron with 750 eV kinetic energy moves along the positive x-axis undeflected. B FB  y v must be in the +z direction, so must be in the –z direction (because the charge on the electron is negative. must be in the +z direction, so must be in the –z direction (because the charge on the electron is negative. FE  -  E z x

  2. A velocity selector consists of magnetic and electric fields. The magnetic field is described by the expression . If B = 0.015 T find the magnitude and direction of such that an electron with 750 eV kinetic energy moves along the positive x-axis undeflected. B FB  y v FE  -  E z x

  3. A velocity selector consists of magnetic and electric fields. The magnetic field is described by the expression . If B = 0.015 T find the magnitude and direction of such that an electron with 750 eV kinetic energy moves along the positive x-axis undeflected. don’t forget to convert eV to J B FB  y v FE  -  E z x this is speed in m/s; getting close to relativistic electron mass is on OSE sheet

  4. A velocity selector consists of magnetic and electric fields. The magnetic field is described by the expression . If B = 0.015 T find the magnitude and direction of such that an electron with 750 eV kinetic energy moves along the positive x-axis undeflected. Problem asks for magnitude and direction, so B FB  y v FE  -  E z x Also “legal:” 

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