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Two capacitors, of capacitances 
and 
, are connected in parallel to a power supply of electromotive force (e.m.f.) 
, as shown in the figure below.
Show that the combined capacitance 
of the two capacitors is given by
Explain your reasoning. You may draw on the figure above if you wish.
Two capacitors of capacitances 
and 
, and a resistor of resistance 
, are connected into the circuit in the figure below.
The battery has an e.m.f. of 
. Show that the combined capacitance of the two capacitors is 
.
in the circuit is the sum of the charges 
and 
flowing through the capacitors with capacitances 
