A cathode ray tube is shown in Figure Q3a Electrons increase speed due to the accelerating voltage before emerging through a

Question

A cathode ray tube is shown in Figure Q3a Electrons increase speed due to the accelerating voltage before emerging through a hole in the anode and then travel into a region between the parallel deflecting plates which have a length of 12 cm and a separation of 4 5 cm In addition a uniform magnetic field can be applied to this region with magnetic field lines passing directly into or out of the diagram Deflecting Plates 0 Cathode Anode Figure Q3a A Cathode Ray Tube A student conducts three experiments with this cathode ray tube using a constant accelerating voltage of 3 8 kV a Show that the electrons leave the hole in the anode at a speed of around 4 x 10 m s and calculate the time taken for these electrons to travel across the length of the deflecting plates 4

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