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Q.

A uniform wire of resistance 20 ohm having resistance $1 Ω / m$ is bent in the adjoining form of a circle as shown in the figure. If the equivalent resistance between M and N is $1.8 Ω$ then the length of the shorter section is :

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a

2 m

b

5 m

c

1.8 m

d

18 m

answer is A.

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Detailed Solution

$\frac{1}{1.8} = \frac{1}{x} + \frac{1}{(20 - x)}$

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