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Two small identical balls carrying charges - 5 nC and 13 nC are placed 40 cm...

Two small identical balls carrying charges - 5 nC and 13 nC are placed 40 cm apart. If the two spheres brought together and touched and then returned to their original positions. The force experienced by them would be

400 nN                   

600 nN   

900 nN   

800 nN

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