42. When the drop is in equilibrium, the force of gravity is balanced by the force of the
electric field:
mg
=
−
qE
, where
m
is the mass of the drop,
q
is the charge on the drop, and
E
is the magnitude of the electric field. The mass of the drop is given by
m
= (4
π
/3)
r
3
ρ
,
where
r
is its radius and
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 Fall '10
 Rebello,NobelS
 Charge, Force, Gravity, Mass, Fundamental physics concepts

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