The deflection system of a cathode-ray oscilloscope usually consists of two pairs of parallel plates producing orthogonal electric fields. Assume the presence of another set of plates in Fig. 3-4 that establishes a uniform electric field Ex= axEx in the denection region. Deflection voltages vx(t)and vy(t)are applied to produce Ex and Ey, respectively. Determine the types of waveforms that vx(t)and vy(t)should have if the electrons are to trace the following graphs on the fluorescent screen:
a) a horizontal line,
b) a straight line having a negative unity slope,
c) a circle,
d) two cycles of a sine wave.
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