H2P-507

Forces in fields

H2 Physics · JC 2 · Hard · Forces in fields

A small oil drop of mass

2.5\times10^{-12}\,\text{kg}

is suspended at rest between two horizontal plates 0.050 m apart with a potential difference of 500 V. The electric field is vertical. What is the charge on the drop? (Take

g = 9.81\,\text{m s}^{-2}

$2.5\times10^{-15}\,\text{C}$
$2.5\times10^{-13}\,\text{C}$
$2.5\times10^{-11}\,\text{C}$
$2.5\times10^{-17}\,\text{C}$

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