Homework Help: Charge that a battery transfers between two plates

1. Mar 7, 2010

jjcm

1. The problem statement, all variables and given/known data
An AA battery (1.5 V potential) is connected to a parallel-plate capacitor having 6.00cm-diameter plates spaced 4mm apart. How much charge does the battery move from one plate to the other?

2. Relevant equations
V=Q/C
C=A$$\kappa$$$$\epsilon$$/d

3. The attempt at a solution
Plugged in values:
C = (.03)2*(8.85*10-12)/.004 = 1.99*10-12
Q = 1.5V * 1.99*10-12f

Getting an incorrect answer for Q. Thoughts?

2. Mar 8, 2010

willem2

You forgot a factor of $\pi$ in the formula for area.