In Millikan's oil drop experiment, an oil drop carrying a charge Q is held stationary by a potential difference 2400 V between the plates. To keep a drop of half the radius stationary, the potential difference had to be made 600 V. What is the charge on the second drop?
A
B
C
Q
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let radius of drop is r. According to Millikan, for balance of drop.
where, V is potential difference and 
is density of drop.
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