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Question

If in the infinite series circuit, C = 9 μF and C1=6μF then the capacity across AB is

A
1.25μF
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B
6μF
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C
3μF
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D
12μF
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Solution

The correct option is C 3μF

1CAB=1c+1c1+x+1c
1x=19+16+x+19
1x16+x=29
6+xxx(6+x)=29
27=x(6+x)
x=3μF

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