A wire of resistance $R$ is bent to form a square $ABCD$ as shown in the figure. The effective resistance between $E$ and $C$ is ( $E$ is mid-point of arm $CD$ )
JEE MAIN 2019, Medium
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$\frac{1}{R_{e q}}=\frac{8}{7 R}+\frac{8}{R}$
$\frac{1}{R_{e q}}=\frac{8+56}{7 R} ; \quad R_{e q i}=\frac{7 R}{64}$
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