Described below is a positively charged particle in a uniform rightward-directed electric field. The particle has a velocity focussed toward the top of the screen. Which of the paths described below right is the particle most likely to follow given that the force if an, exerted on the particle by the electric field is the only force exerted on the particle?

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The electric field exerts a rightward force lying on the positively charge particle. The effect is a rightward acceleration. The preliminary velocity is toward the top of the page at right angles to the acceleration. For the reason that it is at right angles to the acceleration this component of the velocity never changes. The rightward-directed velocity is primarily zero. For the reason that of the rightward acceleration the rightward component of the velocity grows with time. Moving toward the peak of the page at a constant speed while moving rightward at an ever-increasing speed results in a parabolic trajectory such as that depicted by curve b.