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State two uses of capacitors in electrical circuits, other than for the smoothing of direct current.
The combined capacitance between terminals A and B of the arrangement shown in the figure below is 
.
Two capacitors each have capacitance 
and the remaining capacitors each have capacitance 
. The potential difference (p.d.) between terminals A and B is 
.
Determine the capacitance .
Calculate the magnitude of the total positive charge transferred to the arrangement.
Use your answer in (ii) to state the magnitude of the charge on one plate of
a capacitor of capacitance ,
a capacitor of capacitance .
.
.
.
