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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 when a vertical uniform electric field of strength `(81pi)/(7)xx 10^(5) V m^(-1)`. When the field is switched off, the drop is observed to fall with terminal velocity `2 xx 10^(-3) m s^(-1)` . The magnitude of q is (given g = `9.8 m s^(-1), eta_("air") = 1.8 xx 10^(-5)N s m^(-1), rho_("oil") = 900 kg m s^(-3)`, Electric force = charge `xx`electric field )

A

`1.6xx10^(-19) C`

B

`3.2 xx 10^(-19) C`

C

`4.8 xx 10^(-19)C`

D

`8.0xx10^(-19) C`

Text Solution

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The correct Answer is:
D
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