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 e. V kinetic energy moves along the positive xaxis undeflected. B y z x FB FE E v must be in the +z direction, so must be in the –z direction (because the charge on the electron is negative.

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 e. V kinetic energy moves along the positive xaxis undeflected. B y z x FB FE E v

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 e. V kinetic energy moves along the positive xaxis undeflected. B y z FB FE E don’t forget to convert e. V to J v x electron mass is on OSE sheet this is speed in m/s; getting close to relativistic

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 e. V kinetic energy moves along the positive xaxis undeflected. B y z x FB FE E Problem asks for magnitude and direction, so v Also “legal: ”