Why does a charged capacitor transfer only 70% of its charge to an uncharged one?

[jagguy]

Homework Statement

Hi,

I have 2 capacitors c1, c2

c1=.05 uF
c2=.1 uF

Q=CV

c1 is fully charged and connected to a .4V battery in a parallel circuit
c2 is uncharged

c2 was unconnected initially to c1 but once joined c2 can receive a charge from c1.

charge on C1=2 X 10^-8

what is the % charge transferred from c1 to c2 once joined in the circuit

Homework Equations

Q=CV

The Attempt at a Solution

I thought the answer is 100% but it is 70%.

I don't get it?

 

[gneill]

You'll need to make a genuine attempt before help can be given. Show some calculations and describe your thought process.