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  4. 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)

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Q. 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 $CD$)Physics Question Image

JEE MainJEE Main 2019Current Electricity

Solution:

$\frac{1}{R_{eq}} = \frac{8}{7R} + \frac{8}{R}$
$\frac{1}{r_{eq}} = \frac{8+56}{7R}$
$R_{eq} = \frac{7R}{64}$

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