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A charged oil drop remains stationary wh...

A charged oil drop remains stationary when situated between two parallel plates 20 mm apart and a p.d. of 500 V is applied to the plates. Find the charge on the drop if it has a mass of `2xx10^(-4) kg `. Take `g=10 ms^(-2)`.

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The correct Answer is:
` 8 xx 10 ^(-13)C`
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