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Question

If at t=0 switch S is closed, then at steady state find charge (inμC) across each capacitor as shown in figure.


A
4003, 2003, 150
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B
1003, 2003, 50
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C
5003, 4003, 200
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D
5003, 2003, 100
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Solution

The correct option is D 5003, 2003, 100

We can solve this problem by using potential method, by assigning potential to known points as shown in figure.

When switch is closed:

Using Kirchoff`s junction law at junction P, we can write

(Vo40)5+10(V00)+15(V00)=0

5V0200+10V0+15V0=0

200=30V0

V0=203V

Using V0 we can find charge on each capacitor,

Charge on C1 is:

Q1=C1(40203)=5(1003)=5003μC

Similarly, for Q2 and Q3 as follows,

Q2=C2(2030)=10(203)=2003μC

Q3=C3(2030)=15(203)=100 μC

Hence, option (d) is the correct answer.
Why this question:
To understand the application of Kirchhoff's law.

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