12.50: A spatially unifor
;s8 l+2afb9r/o /ru xtxxq4a mm electric field is constrained within the circular region of radius R as shown. The field is directed out of the
2t b8 mr/rl9qfx 4+axos/;aux plane of the page and its strength is decreasing uniformly with time. Which one of the following choices best represents the direction of the Lorentz force on the electron at the instant shown in the figure when the electron is moving up the plane of the page? Ignore gravity