# Insert Dielectric

1. Sep 23, 2007

### Winzer

1. The problem statement, all variables and given/known data
Two identical capacitors and of capacitance 1.20 F are connected in series across a FIXED total potential of 650 V. A dielectric slab of dielectric constant 3.70 can fill and is slowly inserted into that capacitor.
1. What is the change in charge, , on when the dielectric is added to ?
2. What is the change in charge, , on when the dielectric is added to ?

2. Relevant equations
$$C=C_{o}K$$

3. The attempt at a solution
Not quite sure.

2. Sep 23, 2007

### learningphysics

Use Q = CV. which capacitor is the dielectric inserted into?

3. Sep 23, 2007

### Winzer

the first one

4. Sep 24, 2007

### learningphysics

What is the equivalent capacitance of the two series capacitors? Use the Q=CV relationship to get the charge on the equivalent capacitor...

The charge on each capacitor is the same as the charge you get above...