An uncharged capacitor is connected to the terminals of a 3.0 V battery, and 9.0 uC flows to the positive plate. The 3.0 V battery is then disconnected and replaced with a 8.0 V battery, with the positive and negative terminals connected in the same manner as before.

How much additional charge flows to the positive plate?

2 answers

Stored charge is proportional to voltage. It increases by a factor 8/3, becoming 9.0*(8/3) = 24 uC

24 - 9 = ___ uC
15