A G electron gun emits 2 keV energy electrons traveling in the positive direction of x. Electrons are required to strike at point S being the distance GS = 0:1 m. and the GS line forms a 60 angle with the x-axis as shown in the figure. A uniform magnetic field ~B parallel to GS exists in the region outside the electron gun. Calculate the minimum value of the magnetic field B needed to make the electrons stick at point S.