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Q. Equivalent capacity between $A$ and $B$ is:Physics Question Image

Rajasthan PMTRajasthan PMT 1999

Solution:

Equivalent capacity of $1\, \mu F$ and $1\, \mu F$ capacitor joined in parallel
$C'=1+1=2\, \mu F$
image
Now, this circuit can be represented as
image
Now, the total capacity of circuit in series
$\frac{1}{C}=\frac{1}{2}+\frac{1}{1}+\frac{1}{2}$
$C=\frac{1}{2}=0.5\, \mu F$