1. A velocity selector consists of magnetic and electric fields
A velocity selector consists of magnetic and electric fields. The magnetic field is described by the expression If B = 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 - 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 x y z  E

2. A velocity selector consists of magnetic and electric fields
A velocity selector consists of magnetic and electric fields. The magnetic field is described by the expression If B = 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 - v  FE x y z  E

3. A velocity selector consists of magnetic and electric fields
A velocity selector consists of magnetic and electric fields. The magnetic field is described by the expression If B = 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 - v  FE x y z  E
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
A velocity selector consists of magnetic and electric fields. The magnetic field is described by the expression If B = 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 - v  FE x y z  E
Also “legal:” 