- #1

gracy

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## Homework Statement

In the arrangement shown,find the equivalent capacitance between A and B.

## Homework Equations

Capacitance in parallel

##C##=##C_1##+##C_2##

## The Attempt at a Solution

Supplied solution says

As,we can clearly see that ,capacitors 10μF and 20μF are connected between same points ##C## and ##B##(Parallel combination)

__They can be replaced by a single capacitor of capacitance__given by

##C##=10μF+20μF=30μF

Thus circuit can be shown by (b).

Now ,the capacitors 15μF and 30μF are arranged in a row(sweries combination)

the equivalent capacitance is given by C such that

##\frac{1}{C}##=##\frac{1}{15}##+##\frac{1}{30}##=##10##μF

What I did not understand is

__They can be replaced by a single capacitor of capacitance__given by

Why can't I replace them as fllows