A certain number of identical condensers are first connected in series and then

Question

A certain number of identical condensers are first connected in series and then in parallel. If the equivalent capacities in the two cases are found to be in the ratio 1: 9, what is the number of condensers?

Options:

A . 9

B . 3

C . 27

D . 81

Answer: Option B
:
B

\frac{C_{s} e r i e s}{C_{p} a r a l l e l} = \frac{(\frac{C}{n})}{n c} = \frac{1}{n^{2}}

\frac{1}{9} = \frac{1}{n^{2}}

n = 3

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