# A capacitor is made from two 1.90 cm diameter coins separated by a 0.82 mm thick piece of paper (K = 3.70).?

A capacitor is made from two 1.90 cm diameter coins separated by a 0.82 mm thick piece of paper (K = 3.70). A 19.90 V battery is connected to the capacitor.

How much charge is on each coin?

Thank you!!

### 1 Answer

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- az_lenderLv 76 years agoFavorite Answer
The capacitance is kappa*epsilon-nought*A/d.

Here A = pi*r^2 = 2.835 x 10^(-4) m^2

and d = 8.2 x 10^(-4) m.

Epsilon-nought = 8.854 x 10^(-12) F/m

K = 3.70

Capacitance = 11.33 pF

Q = VC = (19.90 V)(11.33 pF) = 225 picocoulombs

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