7. In a mass spectrometer, a beam of singly charged ions of mass 2. 64 x 10 kg is accelerated to a final speed of 6.5 x 10" m/s. A magnetic field then steers the ions in a circle of radius 35 cm. a) Determine the necessary strength of the magnetic field in the mass spectrometer. b) Determine the radius if the beam consisted of electrons instead. Assume they exit at the same final speed. 8. A pair of charged parallel plates are set up as shown in the diagram below with a 120V potential applied across the plates. If an electron travelling at 6 3.5 x 10 m/s enters the electric field as shown, will it escape the parallel plates? 0.20 m 0.15 m