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Charge and potential distribution in series combination - I

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Problem

Three capacitors C1, C2 and C3 are connected as shown below.
  • The capacitances of C1 and C3 are 5.0 μF and 8.0 μF respectively.
  • The charge stored by C3 is Q3=40 μC.
  • Potential difference between the terminals A and B is VAB=16 V.
Find the potential drop across the capacitor C2.
V2= 
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
V
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