Q.

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

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a

10 Ω

b

4 Ω

c

1/4 Ω

d

1/8  Ω

answer is A.

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Detailed Solution

Between the corners, there are two wires in parallel. The resistance of each wire is 2 x 10 ohm. Hence the resistance of combination will be1R=120+120=220  or  R=10Ω
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