Question

Which will have the larger charge? A flat capacitor or a rolled up capacitor? Discuss in full detail.

Answer 1

In general capacitance, C=e0.A/d

and charge Q=CV

i.e capacitance and charge contained are directly propotional. and capacitance is directly propotional to area of plates. the capacitance of a rolled up capacitor is double to that of a plate capacitor of equal surface area - this is based on the fact that once rolled up, each layer has two surfaces facing an oppositely charged surface (one that is above and one below). Thus there would be + - - + + - - + + etc. layers.