Ok I got two questions dealing with Charge and Current. 1) Consider three identical metal spheres . Initally , sphere A contains a charge of 2uC and B contains a charge of 10uC. Sphere C has a charge of -4uC. Spheres A and B touch each other, and then are seperated. Then Sphere B and C touch and then seperate. What is the charge on C now. I had gusses positive and he marked .5 off soo i assume i need a number with that. Not sure what to do with it. 2)If a metal wires carries a current of 80.mA, how long does it take for the 3.00 x10^20 electrons to pass a given corss-sectional area of the wire. I had use I= deltaQ/delta t and had gotten 2 seconds. his resposne was "correct, but now solve for delta t.... i throught i just sloved for it. Thanks for the help.