# A parallel-plate air-filled capacitor having area 31 cm2 and plate spacing 3.0 mm is charged to...

A parallel-plate air-filled capacitor having area 31 cm2 and plate spacing 3.0 mm is charged to a potential difference of 400 V. Find the following values.

(a) the capacitance

pF

(b) the magnitude of the charge on each plate

nC

(c) the stored energy

μJ

(d) the electric field between the plates

V/m

(e) the energy density between the plates

J/m3

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