The equivalent resistance between points A and B in the network shown in figure is:
A
157R
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B
87R
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C
127R
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D
167R
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Solution
The correct option is B87R From symmetry of current distribution, the junction becomes irrelevant, so the network can be modified as From the above circuit, RAB=(R+R||2R+R)||2R ⇒RAB=(R+2R3+R)||2R ⇒RAB=8R3||2R ⇒RAB=87R