A speck of dust of mass 0.10 μg floats between two oppositely charged horizontal metal plates separated by 0.10 m. The potential difference between the plates is 200 V. The speck is not falling at first, but when a beam of ultraviolet light hits it, it starts accelerating downward. However, increasing the potential difference to 250 V reduces the downward acceleration of the speck to zero. Explain the phenomenon qualitatively and quantitatively using symbols.
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