An electron is accelerated through a potential difference of `1000 V` and directed into space between two parallel plates separated by `2 cm` with a potential difference of `100 V` applied across them. If the electron enters perpendicular to the electric field between the polates, what magnetic field perpendicular to both the electron path and the electric field will be neccessary so that the electron may travel undeflected. Take `e=1.6xx10^(-19) C` and `m=9xx10^(31)kg`.

Answer

`2.65 xx 10^(-4) Wbm ^(-2)`