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Two insulating small spheres are rubbed against each other and placed 1 cm apart. If they attract each other with a force of 0.1 N, how many electrons were transferred from one sphere to the other during rubbing?

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`F=(1) /4piepsilon_0xx(nq)^2/r^2 `
` Given , F=0.1 N, r=10^-2m `
` F=(9xx10^-9 xxn^2xx(1.6xx10^-19)^2)/10^-4 `
`rArr n^2=(0.1xx10^-4)/(9xx10^9xx1.6xx1.6xx10^-38) `
` rArr n=2xx10^11`
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