Question

A wire of resistance 5 ohm is bend in the form of a closed circle what is the effective resistance between the two points at the ends of any diameter of that circle
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Answer 1

Answer:

If a wire is bent in form of circle then the two equal parts of wire will act like parallel resistances.

Explanation:

Now the length of wire becomes half if taken as single

so we know R is directly proportional to the length and resistance of single part becomes 5/2 ohm.

Now total resistance

$r \: = \frac{2}{5} + \frac{2}{5} \\ r = \frac{2+ 2}{5} \\ r = \frac{4}{5} \\ r = \frac{5}{4} ohm$

So resistance between two