A drop of oil of density ⍴ and radius r carries a charge q
when placed in an electric field E, it moves upwards with a
velocity v. If ⍴₀ is the density of air, ???? be the viscosity of
the air, then which of the following force is directed
upwards?
(a) qE (b) 6π ηr v
(c)4/3πr³(⍴ - ⍴₀)g
(d) None of these
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