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Capacitors in parallel:
Three capacitors are connected in parallel. If on closing the switch S a current I flows in the circuit, then from Kirchoff's first law:
I = I1 + I2 + I3
therefore It = I1t + I2t + I3t (where 't' is the time)
but Q = It
therefore QTOTAL = Q1 + Q2 + Q3
therefore
but Q/V = C
Therefore C = C1 + C2 + C3
Thus, we may replace capacitors in parallel by a single capacitor whose value is given by the above equation.
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