A spherical oil drop of radius 
has a small charge equivalent to 40 electrons. The energy that would be required to place an additional electron on the drop is,
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Initial charge on the oil drop, 
Potential of the oil drop 
Now, energy required 
work done in bringing an electron from infinity to a point of potential.
As, potential 
Work 
potential × charge 
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