Q). Two point charges of +1.0  μ C are kept stationary 2 m apart. How much work is needed to be done to bring them I m apart?
(1) 4.5 mJ
(2) 9 mJ
(3) 45 mJ
(4) 90 mJ

Whenever there is Work done, you must know it means change in Potential energy
Hope you understand

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