Physics Question Help? (Capacitance)?

Question

Two parallel plates are uncharged. Does the set of plates have a capacitance? Explain.

Answer 1

The plates do have capacitance, and it is equal to

C = k*e0*A/d

where k= dielectric constant of medium between the plate, e0 = permittivity of vacuum, A = plate area, and d = plate separation.

Note there is no charge term in that formula.

Capacitance is just like it sounds: it is the *capacity* to store charge, even if there is none at the moment.

The amount of charge stored = V*C, where V = voltage difference between the plates.