In the diagram, resistance between any two junctions is R. Equivalent resistance across terminals A and B is
A
11R7
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B
18R11
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C
7R11
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D
11R18
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Solution
The correct option is D11R18 RCD=R×2RR+2R=2R3
Similarly, RDB==R×2RR+2=2R3R
Now the equivalent circuit becomes RCB=4R3×R4R3+R=4R23×37R=4R7 RAB=11R7×R11R7+R=11R27×718R=11R18