A parallel-plate air capacitor is made by using two plates 19 cm square, spaced 3.5 mm apart. It is connected to a 3-V battery.
(a) What is the capacitance?
F
(b) What is the charge on each plate?
C
(c) What is the electric field between the plates?
V/m
(d) What is the energy stored in the capacitor?
J
(e) If the battery is disconnected and then the plates are pulled apart to a separation of 7 mm, what are the answers to parts (a)-(d)?
capacitance F
charge C
electric field V/m
energy J