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Two parallel horizontal plane plates are...

Two parallel horizontal plane plates are `30 mm` long and `10 mm` apart. A fine horizontal beam of electrons, moving with a velocity of `5xx10^(6)ms^(-1)` enters the plates mid-way and produces a bright spot of light on a vertical screen `100 mm` beyond the edges of the plates. A potential difference of `10 V` is applieed to the plates. Calculate the deflection of the spot from its initial position.

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24.5 mm
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