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A parallel-plate air capacitor is made by using two plates 18 cm square, spaced 6.0 mm...

A parallel-plate air capacitor is made by using two plates 18 cm square, spaced 6.0 mm apart. It is connected to a 24-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 12 mm, what are the answers to parts (a)–(d)?

capacitance _____F
charge _______C
electric field ________ V/m
energy ______J
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