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  • What will be the equivalent resistance of the network shown in the figure between the terminals 1 and 2.              <img alt="" src="https://cdn.entrance

What will be the equivalent resistance of the network shown in the figure between the terminals 1 and 2.
             

Option: 1

\frac{2}{5} R


Option: 2

\frac{8}{5} R


Option: 3

\frac{7}{5} R


Option: 4

none


Answers (1)

best_answer

The familiar problem can be solved using Kirchhoff’s rule. Here, the problem is going to be simplified using Delta–star Transformation. Before going through the solution, let us understand this Delta–Star Transformation. This figure (a) and (b) show the Delta and Star respectively.    
      
For obtaining the expression for equivalent we first derive expression for resistance between points of terminals and then equating the expression for resistance of the corresponding terminals of two circuits. Now for Delta Configuration the equivalent resistance between a and c,  
   

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