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Q1> A small cork with an excess charge of +5.o C is placed 0.10m from another cork, which carries a charge of -3.1C. The Coulomb constant is given. What is the magnitude of electric force between the corks.

A1> I will be using F = kq1q2/R-squared. The only thing that is throwing me off is... why would the question say excess charge and not just charge. any comments?

Q2> is this force attractive or repulsive

A2> attractive ofcourse

Q3>

__Now this is the part that I am having trouble with.__How many excess electrons are on the negative cork?

A3> Is there some fundamental idea that I am missing here? I dont know how to do this part.

Q4>How many electrons has the positive cork lost?

A4> dont know this one either. Maybe this will become more evident after I know how to solve Q3.

Can anyone help please.

Thanks in advance