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Q.
The figure shows a network of resistors each having value $12 \,\Omega$. Find the equivalent resistance between points $A$ and $B$.
Current Electricity
Solution:
By applying perpendicular axis symmetry, points lying on the line ' $A D$ ' have same potential, therefore resistance between $E F$ and $C D$ can be removed $R_{A B}=9 \,\Omega$