1. A 10.0 μF parallel-plate capacitor with circular plates is
connected to an 8.0-V battery. (a) What is the charge on each
plate? (b) How much charge would be on the plates if their
separation were doubled while the capacitor remained connected to
the battery? (c) How much charge would be on the plates if the
capacitor were connected to the 12.0 V after the radius of each
plate was doubled without changing their separation?
2. A parallel-plate capacitor has plates with an area of 405 cm2
and an air-filled gap between the plates that is 2.25 mm thick. The
capacitor is charged by a battery to 575 V and then is disconnected
from the battery. (a) How much energy is stored in the capacitor?
(b) The separation between the plates is now increased to 4.50 mm.
How much energy is stored in the capacitor now? (c) How much work
is required to increase the separation of the plates from 2.25 mm
to 4.50 mm?