A parallel plate capacitor with plates of area [itex]460 cm^2[/itex] is charged to a potential difference [itex]V[/itex] then disconnected from the source of voltage. When the plates move [itex].3 cm[/itex] farther apart, the voltage between them increases by [itex]120 V[/itex]. What is the charge [itex]Q[/itex] on the positive plate of the capacitor? Answer in [itex]nC[/itex]
The Attempt at a Solution
Inserting one into the other...
distribute and canceling yields...
So using [itex]A=.046 m^2[/itex], I keep getting [itex]16nC[/itex]
Am I doing something wrong assuming [itex]Q[/itex] is constant?