Q3:Two parallel plates A and B are spaced 1 cm apart. A stream of electrons is projected at an accelerating voltage of 2 kV into the space between the plates through a hole in plate A at an angle of 30° to it. Find the value and polarity of the potential difference which is required between A and B in order that the electron just touches plate B.

Q3:Two parallel plates A and B are spaced 1 cm apart. A stream of electrons is projected at an accelerating voltage of 2 kV into the space between the plates through a hole in plate A at an angle of 30° to it. Find the value and polarity of the potential difference which is required between A and B in order that the electron just touches plate B.