12th Class Physics Sample Paper Physics Sample Paper-1

  • question_answer
     A network of six identical capacitors, each of capacitance C is made in figure. Find the equivalent capacitance between the points A and B.
       Network of six identical capacitors


                The capacitors can be rearranged as shown below.                         Simplified circuit diagram of capacitors The equivalent capacitance is the resultant of parallel combination of two rows in which each row consists of 2C and C in series, i.e. Simplified arranged capacitors Here, 2C and C are in series. So, their equivalent capacitance is             \[\frac{1}{{{C}_{1}}}=\frac{1}{2C}+\frac{1}{C}\]       \[\left[ \because \frac{1}{{{C}_{S}}}=\frac{1}{{{C}_{1}}}+\frac{1}{{{C}_{2}}} \right]\]                         \[=\frac{3}{2C}\] \[\therefore \]                  \[{{C}_{1}}=\frac{2C}{3}\] Similarly,           \[{{C}_{2}}=\frac{2C}{3}\] Now, \[\frac{2C}{3}\] and \[\frac{2C}{3}\] are in parallel. \[{{C}_{eq}}=\frac{2C}{3}+\frac{2C}{3}=\frac{4C}{3}F\]       \[[\because {{C}_{P}}={{C}_{1}}+{{C}_{2}}]\] \[\therefore \] Equivalent capacitance between the points A and B is \[\frac{4C}{3}.\]

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