Question

In an oscilloscope, the cathode emits the electrons which are accelerated by the anodes. Explain the kind of voltages to be applied to the horizontal and vertical plates so that images formed on the deflecting screen are
(a) horizontal line

(b) vertical line

Answer 1

(a) To get horizontal line on the screen, an AC voltage should be applied to the vertical defecting plate and no voltage should be applied on horizontal deflecting plates.
(b) To get vertical line, an AC voltage should be applied to the horizontal deflecting plate and no voltage on the vertical plates.