Five resistors are connected as shown in the diagram. The equivalent resistance between $A$ and $B$ is .............. $ohm$
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Since the given bridge is balanced, hence there will be no current through $9\,\Omega $ resistance. This resistance has no effect and must be ignored in the calculations.
${R_{AB}} = \frac{{9 \times 18}}{{27}} = 6\,\Omega $
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