**Capacitors in series**

Figure shows capacitors C

_{1}and C_{2}combined in series.
The left plate of C

_{1}and the right plate of C_{2}are connected to two terminals of a battery and have charges Q and –Q, respectively.
It then follows that the right plate of C

_{1}has charge –Q and the left plate of C2 has charge Q. If this was not so, the net charge on each capacitor would not be zero.
This would result in an electric field in the
conductor connecting C

_{1}and C_{2}. Charge would flow until the net charge on both C_{1 }and C_{2}is zero and there is no electric field in the conductor connecting C_{1}and C_{2}. Thus, in the series combination, charges on the two plates (±Q) are the same on each capacitor.
The total potential drop V across the combination
is the sum of the potential drops V and V across C and C, respectively.

Following the same steps as for the case of two capacitors, we
get the general formula for effective capacitance of a

**series combination of n capacitors**:**Capacitors in parallel**

Figure shows two capacitors arranged in parallel. In this case,
the same potential difference is applied across both the capacitors.

But the plate charges (±Q

_{1}) on capacitor 1 and the plate charges (±Q_{2}) on the capacitor 2 are not necessarily the same:
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