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Four wires of equal length and resistance 10 a9 each are connected in the form of a square. The equivalent resistance between two opposite corners of the square is

1. 10 a9
2. 40 a9
3. 20 a9
4. 10/4 a9

Correct answer: 10 a9

Solution

Between opposite corners of a square, current can go through two equal paths, each containing two 10 a9 resistors in series. So each path has resistance 20 a9, and these two 20 a9 branches are in parallel, giving 10 a9.

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