Al3+ {aluminum 3+) is an ion which in large concentration can be neurotoxic and contribute to diseases in the brain. A mass spectrometer can be used to determine the levels of aluminum 3+ [13 protons. 14 neutrons. and 10 electrons]. In this an ion is at rest on the positive plate of a parallel plate apparatus. is accelerated through the hole of the negative plate. after which it maintains a constant speed in a uniform magnetic field of 0.15 T [in to the page]. The speed as it leaves the plates and enters the magnetic field is 6.5 x 104 mz's. (a) Determine the voltage across the parallel plates. (Hint: Consider the number of excess or deficit electrons for the ion} [b] Determine the initial magnetic force {magnitude and direction) experienced bv the electron as it enters the magnetic field. (cl Where should the detector be placed relative to where the charge entered the field? + - x x x x A|3+ l .I- x x x x x x x 3-: mp : L57 x 10-2? kgmn : 1. 67 x 1027 kg; me : 9.11 x 1031 kg