If a capacitor has opposite 4.0µC charges on the plates, and an electric field o

Question

If a capacitor has opposite 4.0µC charges on the plates, and an electric field of1.8 kV/mm is desired between the plates,what must each plate's area be?
m2

A charge Q creates an electric potential of +138 V at a distance of 16 cm.What is Q?
nC
A 5400 pF capacitor holds plus andminus charges of 15.5 X 10^ -8 C.What is the voltage across the capacitor? V If a capacitor has opposite 4.0 Mu C charges on the plates, and an electric field of1.8 kV/mm is desired between the plates,what must each plate's area be? m^2 A charge Q creates an electric potential of +138 V at a distance of 16 cm.What is Q? nC

Explanation / Answer

1) V = Q/C = 15.5 x 10-8C/5400pF = 28.7V 2) E = Q/(A) Implies, A = Q/(E) = 0.25 m2 3) V = q/(4r) Implies, Q = 4rV = 2.45nC

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