
#1
Jan2808, 09:11 AM

P: 48

1. The problem statement, all variables and given/known data
A metal sphere has a charge of +8.0 µC. What is the net charge after 9.00 *10^13 electrons have been placed on it? 2. Relevant equations q=Ne where q is the charge, N is the number of electrons, and e is given as 1.6*10^19 3. The attempt at a solution Well the problem gives us a charge, q, and the N, number of electrons, so I figure somehow I need to use this equation. I am not sure where to start though, could someone get me started? Thanks! 



#2
Jan2808, 10:00 AM

Emeritus
Sci Advisor
PF Gold
P: 4,975

The electrons have a negative charge. That charge will be given by the product of the number of electrons and the charge of the electrons. Since the sphere starts with a positive charge the net charge will be the initial positive charge plus whatever charge all the electrons have. Be careful with signs here.




#3
Jan2808, 03:15 PM

P: 48

I'm still having trouble...what number needs to be negative?




#4
Jan2808, 03:20 PM

Emeritus
Sci Advisor
PF Gold
P: 4,975

Finding the Net charge
Electrons have a negative charge.



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