3. Electrons leave the cathode of an electron device and move to the anode. The electric potential difference between the cathode and anode is 2.0x102 V. The initial speed of electrons is negligible. Determine the speed of the electrons near the anode.(3T) 4. In an experiment, an electron beam is passed through perpendicular electric and magnetic fields. The electrons have a speed of 2.6 x 104m/s. The magnetic field is 2.5 x 1041". a. What electric field is needed so that the electrons are undeflected? Sketch a diagram. (2T, 2C) b. If the distance between the metallic plates that create the electric field is 0.40 cm, what voltage must be applied to the plates? c. If the electric field is shut off, what would the radius of the beam become? (4A) 5. A charged particle with a momentum of 4.00 x 10'15kg - m/s enters at right angles a magnetic field of 0.650 T and goes into a circular orbit of radius 4.80 cm. Determine the charge ofthe particle? (2T)