In the given circuit, C1=2 μF, C2=0.2 μF, C3=2 μF, C4=4 μF, C5=2 μF, C6=2 μF, the charge stored on capacitor C4 is ______ μC. [2023]
(4)
Ceq=0.5 μF
Q=0.5×10=5 μC
Q'=5 μC×0.80.8+0.2=4 μC