12.50: A spatially uniform electric field is constrained within the
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g 8v .qqtx/w)wyk 2o-p/g qz)s3bdlr-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