You wish to design a velocity selector that will allow protons to pass through only if they have a speed of 500 m/s.
(a) If the magnetic field is B = 0.050 T, what electric field do you need?
(b) You decide to produce this electric field using a parallel-plate capacitor with a plate spacing of 1.0 mm. What is the electric potential across the plates?
(c) Will your velocity selector also work for Li ions? For Mg2 ions? Explain why or why not.