A) \[U\]
B) \[2U\]
C) \[3U\]
D) \[4U\]
Correct Answer: B
Solution :
As, potential energy of the system when there is two changes is \[Ui=U.\] Now, when these are three charges situated of the three corners is \[{{U}_{f}}=U\] \[\therefore \] \[{{U}_{l}}={{U}_{f}}-{{U}_{i}}=3U-U=2U\] \[=2U\] (in magnitude)You need to login to perform this action.
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