12.50: A spatially uniform electric field
p/dce1-9yz xy x9 ehy/is constrained within the circular region of radius R as shown. The field is directed out of the 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
1dy -e9p/xc/xhyye9z electron is moving up the plane of the page? Ignore gravity