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A tiny spherical oil drop carrying a net...

A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electric field of strength `(81pi)/7 xx10^(5) "Vm"^(-1)` . When the field is switched off , the drop is observed to fall with terminal velocity `2xx10^(-3) "ms"^(-1) ` Given `g = 9.8 "ms"^(-2)` viscosity of the air ` = 1.8 xx10^(15) Ns m^(-2)` and the density of oil `= 900 " kg "m^(-3)` the magnitude of q is :

A

`1.6 xx10^(-19)C`

B

`3.2 xx10^(-19)C`

C

`4.8 xx10^(-19)C`

D

`8.0 xx10^(-19)C`

Text Solution

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The correct Answer is:
D
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