Question

The equivalent resistance seen across the terminal A' and 'B in the figure given below is

• A. $2\Omega$
• B. $4\Omega$
• C. $6\Omega$
• D. $8\Omega$

Answer 1

The correct option is B $4\Omega$

Redrawing the given circuit , we get

Using $\Delta$ to Y conversion, we get,

Again using Y to $\Delta$ conversion, we have

or, $R_{AB}=10.67\Omega ||(3.2\Omega +3.2\Omega )$

$=\frac{10.67\times 6.4}{10.67+6.4}=3.99\Omega =4\Omega$