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# Two identical spheres carrying charges -9microC and 5 microC respectively are kept in contact and then seperated from each other. Point out true state ment from the following the answer is 1.25 ×10(13) electrons are in excess.HOW?

Eshan
The charge on each of the spheres after coming in contact is$\dpi{80} \dfrac{-9+5}{2}\mu C=-2\mu C$
Hence excess electrons on each of them are$\dpi{80} \dfrac{2\times 10^{-6} C}{1.6\times ^{-19}}=1.25\times 10^{13}$