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Two identical metal spheres posses +60 c and -20 c of charges. They are bought in contact and then seperated by 10 cm.The force between them is
charge on each sphere after they are bought in contact = (60-20)/2 = 20 CF = K*20*20/0.12 = 9*109*4*102/10-2 = 3.6*1014 NHope it clears.
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