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A negatively charged oil drop is prevent...

A negatively charged oil drop is prevented from failing under gravity by applying a vertical electric field `100 Vm^(-1)`. If the mass of the drop is `1.6 xx 10^(-3)g` the number of electrons carried by the drop is `(g=10 ms^(-2))`

A

`10^(18)`

B

`10^(15)`

C

`10^(6)`

D

`10^(12)`

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