9. In Millikan's oil drop experiment an oil
drop is held stationary by p.d) of 400 V,
if another drop of double the radius bu
carries same charge is to be held
stationary, the p.d) required is
a) 800 V
b) 1600 V
c) 3200 V
d) 400 V
The strona

From the figure, F
e

and F
g

represents electric and gravitational forces respectively.
We can observe that,

V∝
q
m

and in turn m∝r
3

given V = 400V is initial voltage and let V
1

substituting these values in the respective equations we get

V
V
1

=
r
3
(q)
(2r)
3
q

solving the above eqaution will give us
V
1

=8×V=3200 V
So, the answer is option (C).

Answer Link

9. In Millikan's oil drop experiment an oildrop is held stationary by p.d) of 400 V,if another drop of double the radius bucarries same charge is to be heldstationary, the p.d) required isa) 800 Vb) 1600 Vc) 3200 Vd) 400 VThe strona​

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9. In Millikan's oil drop experiment an oil
drop is held stationary by p.d) of 400 V,
if another drop of double the radius bu
carries same charge is to be held
stationary, the p.d) required is
a) 800 V
b) 1600 V
c) 3200 V
d) 400 V
The strona