Explain what is meant by the capacitance of a parallel plate capacitor.
A parallel plate capacitor C is connected into the circuit shown in the figure below.
When switch S is at position X, the battery of electromotive force 
and negligible internal resistance is connected to capacitor C. When switch S is at position Y, the capacitor C is discharged through the sensitive ammeter. The switch vibrates so that it is first in position X, then moves to position Y, and then back to position X fifty times each second. The current recorded on the ammeter is 
. Determine
the charge, in coulomb, passing through the ammeter in 
,
the charge on one plate of the capacitor, each time that it is charged,
the capacitance of capacitor C.
A second capacitor, having a capacitance equal to that of capacitor C, is now placed in series with C. Suggest and explain the effect on the current recorded on the ammeter.
.
.
.
