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  • A finite square grid with each link having resistance r is fitted in a 0 resistance conducting circular wire. Determine equivalent resistance between A and B. <img alt="" src="https://cdn

A finite square grid with each link having resistance r is fitted in a 0 resistance conducting circular wire. Determine equivalent resistance between A and B.

Option: 1

\frac{21}{40}r


Option: 2

2r


Option: 3

3r


Option: 4

\frac{r}{2}


Answers (1)

best_answer

Since A, P, Q and R are at same potential, the following circuit can be redrawn as (taking x=r/2)

So, equivalent resistance between A and B =\frac{21}{10}x=\frac{21}{40}r

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Rishi

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