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Question

Six point charges, each of +1 C, are brought together to the vertices of regular hexagon from infinity one by one. Assuming infinity as the reference point, what is the change in potential energy of the system?
Take the length of each side of the hexagon to be 1m.


A
Positive
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B
Negative
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C
Zero
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D
None of these
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Solution

The correct option is A Positive
Change in potential energy is positive if the work done by the external agent in bringing the charges to form the system is positive, which is exactly the case in the given situation!

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