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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.
(Ans; 500 V)
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