A wire of resistance R and length l is bent into a square.Find the effective resistance betwe

Let a, be the side of the resultant square.

Between any two opposite ends, the length is 2a.

Total length = 4a = l.

Since R  l, the two resistance between opposite ends, i.e. R₁ and R₂ are equal and,

R₁  R₂  l/2  R/2. 

The equilalent resistance = R₁R₂/(R₁+R₂)

= R²/4/(R/2+R/2) = R/4   Answer.

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