In the arrangement of capacitors shown in Figure, if each capacitor is 9 pF, the effective capacitance between A and B is
10pF
15pF
20pF
5pF
A
20pF
B
15pF
C
10pF
D
5pF
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Solution
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capacitor in parallel
c3+c1=18pf=c′
and in series
1c=1c′+1c2
118+19
= 16
c′=6pf
so equivalent = ( 9 + 6 ) pf
=15pf
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