The network of six capacitors is as shown in figure. The equivalent capacitance between $\mathrm{A}$ and…

The network of six capacitors is as shown in figure. The equivalent capacitance between $\mathrm{A}$ and $\mathrm{B}$ is
  1. $\frac{2 C}{3}$
  2. $\frac{4 C}{3}$
  3. 2C
  4. 3C

Solution

Consider the following diagram with nodes Q having same potential due to the symmetry of the circuit: Taking the similar nodes together the equivalent diagram can be drawn as: Therefore, the eqiuvalent capacitance between $\mathrm{AQ}=3 C+2 C+C=6 C$ the equivalent capacitance between $\mathrm{QB}=3 C+2 C+C=6 C$ Now, for equivalent capacitance between $A B$ $\begin{aligned} & \frac{1}{C_{\mathrm{AB}}}=\frac{1}{6 C}+\frac{1}{6 C}=\frac{1}{3 C} \\ & \therefore C_{\mathrm{AB}}=3 C \end{aligned}$

Asked in: MHT CET 2022 (08 Aug Shift 1)

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