## College Physics (4th Edition)

The new charge of the sphere is $~2.7~nC$ The new charge of the rod is $~-4.7~nC$
We can assume that the electrons are transferred from the negatively charged rod to the positively charged sphere. We can find the charge of $8.2\times 10^9$ electrons: $q = (8.2\times 10^9)(-1.6\times 10^{-19}~C)$ $q = -1.3\times 10^{-9}~C$ $q = -1.3~nC$ The new charge of the sphere is $4.0~nC-1.3~nC$ which is $2.7~nC$ The new charge of the rod is $-6.0~nC-(-1.3~nC)$ which is $-4.7~nC$