A) \[8\times {{10}^{-18}}J\]
B) \[8\times {{10}^{-19}}J\]
C) \[8\times {{10}^{-20}}J\]
D) \[8\times {{10}^{-16}}J\]
E) \[4\times {{10}^{-18}}J\]
Correct Answer: A
Solution :
Required work done, \[W=QV\] \[=(2e)\times 25\] \[=50\,e=50\times 1.6\times {{10}^{-19}}\] \[=8\times {{10}^{-18}}J\]
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