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Course: Electromagnetism (Essentials) - Class 12th > Unit 7

Lesson 3: How touchscreens work? - Combination of capacitors
Science
Electromagnetism (Essentials) - Class 12th
How touchscreens work?
How touchscreens work? - Combination of capacitors
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Charge and potential distribution in parallel combination - I

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Problem

A part of a circuit consists of four capacitors C1, C2, C3 and C4 as shown below.
  • The capacitances of C2 and C3 are 4.0 μF and 6.0 μF respectively.
  • Charge stored on the capacitor C1 is Q1=25 μC.
  • The potential drop across capacitor C2 is V2=2.0 V.
Find the charge stored in capacitor C4.
Q4= 
  • 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
μC