Question

The given graph shown the variation of charge q versus potential difference v for two capacitors C1 and C2

both the capacitors have same plate separation but plate area of C2 is greater than that C1which line (A or B)

corresponds to C1 and why ?​

Answer 1

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Q represents C2 and P represents C1

Reason: From the graph the slope q/v= Capacitance is greater for Q.

Also according to given conditions the capacitance εA/d  i.e C∝A

so capacitance is larger for the 

C2 because the area of its plates is large and d for the two capacitor is same. 

Hence, Q represents C2.