Figure shows charge  $\left(q\right)$  versus voltage $\left(V\right)$  graph for series and parallel combination of two given capacitors.  The capacitance of one capacitor is  $10\mu F$  then capacity of other in  $\mu F$  is ____

For parallel combination 
 $q=10(C_1+C_2)$
 $q_1=500\mu C$
 $500=10(C_1+C_2)$
 $C_1+C_2=50\mu F \mathrm{...}\left(i\right)$
For Series Combination....
 $q_2=10\frac{C_1{C}_2}{(C_1+C_2)}$
$80=10\frac{C_1{C}_2}{50}$     From equation    .....(ii)
 $C_1{C}_2=400 \mathrm{....}\left(iii\right)$
From equation (i) and (ii)
$C_1=10\mu F{C}_2=40\mu F$