Charges, fields, and potentials (MC) A. Two charged parallel plates are used in many devices like a mass spectrometer or a cyclotron to speed up ions or elementary particles. The two parallel plates are raised to different voltages, which results in an electric field between the plates. Charged ions drift through a small hole in one of the plates and are accelerated by the field between the plates. The figure on the right shows a C14+ ion about to drift into the region between the plates. As it is accelerated, it will pass through the points marked a and b. At which point will the magnitudes of the electric field, the b electric potential, the force felt by the ion, and the acceleration of the ion be greater? Check one answer from each column. (The plates are close enough 14 together that they can be approximated as infinitely large and the holes through which the ions enter and leave are small enough that their effect on the field may be ignored.) -50 V +100 V E Field Potential Force Acceleration E > E. V. > Vb F. > F a>ab E, = Eh V. = V. F =Fb a=ab E