In each of six situations, a particle (mass m, charge q) moves from a point where the potential is V_i to a point where the potential is V_f. Apart from the electric force, no forces act on the particles. Rank them in order of the particle's change in kinetic energy, from largest to smallest. Rank increases (positive changes) higher than decreases (negative changes).

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(а) т %3D 5 х 10-15 g, q = -5 nC, V; = 100 V, V = -50 V %3D %3D g, q = -5 nC, Vị = -50 V, Vf = 50 V (c) m = 1 x 10-15 g, q = 25 nC, V = 50 V, Vf = 20 V (b) m = 1 x 10-15 %3D (d) т%3D 5 х 10-15 (e) m = 25 x 10-15 g, q = -1 nC, V¡ = 400 V, Vf = -100 V %3D g, q = 1 nC, V¡ = -100 V, Vf = -250 V m = 1 x 10-15 g, q = 5 nC, V = 100 V, Vf = 250 V (f)