In the arrangement of resistances shown below, the effective resistance between points $A$ and $B$ is ............... $\Omega$
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(a) By the concept of balanced Wheatstore bridge, the given circuit can be redrawn as follows
$ \Rightarrow $ ${R_{AB}} = \frac{{30 \times 60}}{{(30 + 60)}} = 20\,\Omega $
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