In Millikan’s oil drop experiment an oil drop of radius 
and change 
is held in equilibrium between the plates of a charged parallel plate capacitor when the potential difference is 
. To keep a drop of radius 
and with a charge 
in equilibrium between the plates the potential difference 
required is:
A
B
2 
C
4 
D
8 
Text Solution
Verified by ExpertsThe correct answer is:
C
In Millikan’s oil drop experiment,
Here 
and 
or 
For second oil drop, 
or 
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