Answer
We can rank the arrangements according to the linear momentum of the proton at point B:
$(a) \gt (b) \gt (c)$
Work Step by Step
In arrangement (a), the field lines are closer together which indicates that the magnitude of the electric field is larger. Therefore, the proton will accelerate at a greater rate as it moves from A to B. The proton will have the largest linear momentum in this arrangement.
In arrangement (c), the field lines are farther apart which indicates that the magnitude of the electric field is smaller. Therefore, the proton will accelerate at a smaller rate as it moves from A to B. The proton will have the smallest linear momentum in this arrangement.
In arrangement (b), the field lines are close together near A and farther apart near B. Therefore, the proton will have a larger linear momentum in this arrangement than in arrangement (c), but a smaller linear momentum than in arrangement (a).
We can rank the arrangements according to the linear momentum of the proton at point B:
$(a) \gt (b) \gt (c)$
