Two cylindrical cans with insulating sides and conducting end caps are filled with water, attached to the circuitry shown in (Figure 1), and used to determine salinity levels. The cans are identical, with radius r = 5.30 cm and length L = 2.50 cm. The battery supplies a potential of 10.0 V, has a negligible internal resistance, and is connected in series with a resistor R = 14.0 ?. The left cylinder is filled with pure distilled water, which has infinite resistivity. The right cylinder is filled with a saltwater solution. It is known that the resistivity of the saltwater solution is determined by the relationship ? = (s0/s)??m, where s is the salinity in parts per thousand (ppt) and s0 = 6.30 ppt.

The left cylinder acts as a capacitor. Use the equation C = ?A/d for its capacitance. How much charge is present on its upper plate? Note that pure water has a dielectric constant of 80.4.

I found the capacitance and now I am not sure what to do. I got C = 2.5x10^-10 now i just need to find the charge of the upper plate of the left cylinder.

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