Questions  

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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By Expert Faculty of Sri Chaitanya
a
10 Ω
b
4 Ω
c
1/4 Ω
d
1/8  Ω
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detailed solution

Correct option is A

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

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