How Many Electrons Transfer to Equalize Charge Between a Plate and a Rod?

[gatorgrl1118]

A plate carries a charge or -3.0 microC) while a rod carres a charge of +2.0 microCs. How many electrons must be transferred from the plate to the rod so that both obejcts have the same charge?


e = 1.6 X 10^-19 C. 6.25 X 10^18 e per C of negative energy..


What I've done is -3.0 mC/6.25 X 10^18= -4.8 X 10^11. 2.0 mC/ 6.25 X 10^18= 3.2 X 10^11. Added up is 1.6 X 10^11

The solution is 1.6 X 10^13 however I keep getting 1.6 X 10^11. Can someone help me out with this? What am I doing wrong? Thanks!

 

[G01]

I get 1.6 X 10^-13 electrons. Check your units. Remember that:

$$1\mu C=10^{-6}C$$

 

[gatorgrl1118]

Would you be able to show me how you worked that because now I am getting -1.6 X 10^-25. I'm completely confused. Thanks.

 

[G01]

Ok, well let me ask you this:

How much charge moves from one to the other so they have equal charge?

Once you know this, how did you convert the charge measurements to number of electrons?