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Q.

A spherical drop of radius 10−6m  has absorbed 20 electrons.  The energy required to give an additional electron to it is

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a

4.6×10−21J

b

5.7×10−21J

c

9.21×10−23J

d

5.96×1024J

answer is A.

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Detailed Solution

U=14π∈0q1q2r     =9×109×20×(1.6×10−19)210−6=4·6×10-21J
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A spherical drop of radius 10−6m  has absorbed 20 electrons.  The energy required to give an additional electron to it is